diff --git a/app/admin-app.tsx b/app/admin-app.tsx
index 0c47346..3279220 100644
--- a/app/admin-app.tsx
+++ b/app/admin-app.tsx
@@ -1596,6 +1596,7 @@ function PartnersPage({
   const [createOpen, setCreateOpen] = useState(false);
   const [createDraft, setCreateDraft] = useState({ name: "", wecomUserid: "" });
   const [createSaving, setCreateSaving] = useState(false);
+  const [userPickerOpen, setUserPickerOpen] = useState(false);
 
   const filteredPartners = useMemo(
     () =>
@@ -2144,16 +2145,26 @@ function PartnersPage({
               </label>
               <label>
                 <span>企业微信 userid *</span>
-                <input
-                  value={createDraft.wecomUserid}
-                  onChange={(event) => setCreateDraft({ ...createDraft, wecomUserid: event.target.value })}
-                  placeholder="例如：zhangsan"
-                />
+                <div className="field-with-action">
+                  <input
+                    value={createDraft.wecomUserid}
+                    onChange={(event) => setCreateDraft({ ...createDraft, wecomUserid: event.target.value })}
+                    placeholder="例如：zhangsan"
+                  />
+                  <button
+                    type="button"
+                    className="ghost-button"
+                    onClick={() => setUserPickerOpen(true)}
+                    disabled={createSaving}
+                  >
+                    从企微选择
+                  </button>
+                </div>
               </label>
             </div>
             <p className="project-chat-hint">
-              userid 在企业微信管理后台「通讯录」成员详情中查看。群主合作方是内部员工，
-              用于在任务中心的项目分组中把任务群映射到负责人。
+              可从企业微信通讯录选择，或手动填写 userid（在企业微信管理后台「通讯录」成员详情中查看）。
+              群主合作方是内部员工，用于在任务中心的项目分组中把任务群映射到负责人。
             </p>
             <div className="modal-actions">
               <button type="button" className="ghost-button" onClick={() => setCreateOpen(false)} disabled={createSaving}>取消</button>
@@ -2164,6 +2175,22 @@ function PartnersPage({
           </div>
         </div>
       )}
+      {userPickerOpen && (
+        <WecomUserPickerModal
+          mode="single"
+          selected={
+            createDraft.wecomUserid.trim() ? [createDraft.wecomUserid.trim()] : []
+          }
+          onClose={() => setUserPickerOpen(false)}
+          onConfirm={(userids) => {
+            setCreateDraft((previous) => ({
+              ...previous,
+              wecomUserid: userids[0] ?? "",
+            }));
+            setUserPickerOpen(false);
+          }}
+        />
+      )}
       {pickerPartner && (
         <div className="modal-backdrop" role="presentation" onMouseDown={closePicker}>
           <div className="modal-card wecom-picker-modal" onMouseDown={(event) => event.stopPropagation()}>
@@ -2883,6 +2910,223 @@ function ProjectSection({
   );
 }
 
+type InternalWecomContact = {
+  userid: string;
+  name: string;
+  departmentNames: string[];
+};
+
+let internalWecomContactsCache: {
+  contacts: InternalWecomContact[];
+  fetchedAt: number;
+} | null = null;
+
+const INTERNAL_WECOM_CONTACTS_TTL_MS = 5 * 60 * 1000;
+
+function WecomUserPickerModal({
+  mode,
+  selected,
+  onClose,
+  onConfirm,
+}: {
+  mode: "single" | "multi";
+  selected: string[];
+  onClose: () => void;
+  onConfirm: (userids: string[]) => void;
+}) {
+  const [contacts, setContacts] = useState<InternalWecomContact[]>(
+    internalWecomContactsCache?.contacts ?? [],
+  );
+  const [fetchedAt, setFetchedAt] = useState(0);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState("");
+  const [search, setSearch] = useState("");
+  const [checked, setChecked] = useState<string[]>(selected.filter(Boolean));
+
+  const loadContacts = useCallback(async (force = false) => {
+    const snapshot = internalWecomContactsCache;
+    if (
+      !force &&
+      snapshot &&
+      Date.now() - snapshot.fetchedAt <= INTERNAL_WECOM_CONTACTS_TTL_MS
+    ) {
+      setContacts(snapshot.contacts);
+      setFetchedAt(snapshot.fetchedAt);
+      setLoading(false);
+      return;
+    }
+    setLoading(true);
+    setError("");
+    try {
+      const response = await fetch("/api/action", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ action: "wecom_list_internal_contacts" }),
+      });
+      const parsed = await readApiResponse<{
+        contacts?: InternalWecomContact[];
+        error?: string;
+      }>(response, "获取企业微信通讯录失败");
+      if (!response.ok) {
+        throw new Error(parsed.error || "获取企业微信通讯录失败");
+      }
+      const list = Array.isArray(parsed.contacts) ? parsed.contacts : [];
+      internalWecomContactsCache = { contacts: list, fetchedAt: Date.now() };
+      setContacts(list);
+      setFetchedAt(internalWecomContactsCache.fetchedAt);
+    } catch (reason) {
+      setError(
+        reason instanceof Error ? reason.message : "获取企业微信通讯录失败",
+      );
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    const timer = window.setTimeout(() => {
+      void loadContacts();
+    }, 0);
+    return () => window.clearTimeout(timer);
+  }, [loadContacts]);
+
+  const keyword = search.trim().toLowerCase();
+  const filteredContacts =
+    keyword.length === 0
+      ? contacts
+      : contacts.filter((contact) =>
+          `${contact.name} ${contact.userid}`.toLowerCase().includes(keyword),
+        );
+
+  const toggleChecked = (userid: string) => {
+    setChecked((previous) =>
+      previous.includes(userid)
+        ? previous.filter((item) => item !== userid)
+        : [...previous, userid],
+    );
+  };
+
+  return (
+    <div className="modal-backdrop" role="presentation" onMouseDown={onClose}>
+      <div
+        className="modal-card wecom-picker-modal"
+        onMouseDown={(event) => event.stopPropagation()}
+      >
+        <div className="modal-heading">
+          <div>
+            <h2>选择企业微信成员</h2>
+            <p>
+              从企业微信通讯录（自建应用可见范围）中挑选，
+              {mode === "multi" ? "勾选后点击确定" : "点击成员即填入"}。
+            </p>
+          </div>
+          <button type="button" onClick={onClose} aria-label="关闭">×</button>
+        </div>
+        <div className="import-guide-strip">
+          <input
+            type="search"
+            className="wecom-picker-search"
+            placeholder="按姓名 / userid 搜索"
+            value={search}
+            onChange={(event) => setSearch(event.target.value)}
+            disabled={loading}
+          />
+          <button
+            type="button"
+            className="ghost-button"
+            onClick={() => void loadContacts(true)}
+            disabled={loading}
+          >
+            {loading ? "拉取中…" : "刷新列表"}
+          </button>
+          {fetchedAt > 0 && !loading && (
+            <span className="wecom-picker-cache-hint">
+              缓存于 {new Date(fetchedAt).toLocaleTimeString()}（5 分钟内复用）
+            </span>
+          )}
+        </div>
+        {error && (
+          <p className="form-error">
+            {error} 可关闭此弹窗，直接在输入框手动填写 userid。
+          </p>
+        )}
+        <div className="wecom-picker-list">
+          {loading && contacts.length === 0 ? (
+            <div className="wecom-picker-empty">正在拉取企业微信通讯录…</div>
+          ) : contacts.length === 0 ? (
+            <div className="wecom-picker-empty">
+              {error
+                ? "拉取失败，请检查应用配置（通讯录权限 / 可信 IP）后重试"
+                : "未拉取到通讯录成员——仅显示自建应用可见范围内的成员，也可手动填写 userid"}
+            </div>
+          ) : filteredContacts.length === 0 ? (
+            <div className="wecom-picker-empty">没有匹配的成员</div>
+          ) : (
+            filteredContacts.map((contact) => {
+              const isSelected =
+                mode === "multi"
+                  ? checked.includes(contact.userid)
+                  : selected.includes(contact.userid);
+              const rowBody = (
+                <>
+                  <span className="wecom-picker-avatar placeholder" aria-hidden="true">
+                    {(contact.name || contact.userid).slice(0, 1)}
+                  </span>
+                  <span className="wecom-picker-meta">
+                    <span className="wecom-picker-name">
+                      {contact.name || contact.userid}
+                    </span>
+                    <span className="wecom-picker-sub">
+                      {contact.departmentNames.join(" / ") || "—"}
+                    </span>
+                    <code className="wecom-picker-id">{contact.userid}</code>
+                  </span>
+                </>
+              );
+              return mode === "multi" ? (
+                <label key={contact.userid} className="wecom-picker-row">
+                  {rowBody}
+                  <input
+                    type="checkbox"
+                    checked={isSelected}
+                    onChange={() => toggleChecked(contact.userid)}
+                  />
+                </label>
+              ) : (
+                <button
+                  key={contact.userid}
+                  type="button"
+                  className="wecom-picker-row"
+                  onClick={() => onConfirm([contact.userid])}
+                >
+                  {rowBody}
+                  {isSelected ? (
+                    <span className="wecom-picker-current">当前</span>
+                  ) : null}
+                </button>
+              );
+            })
+          )}
+        </div>
+        {mode === "multi" && (
+          <div className="modal-actions">
+            <button type="button" className="ghost-button" onClick={onClose}>
+              取消
+            </button>
+            <button
+              type="button"
+              className="primary-button"
+              onClick={() => onConfirm(checked)}
+            >
+              {checked.length > 0 ? `确定（${checked.length} 人）` : "确定"}
+            </button>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
 function ProjectEditorModal({
   draft,
   saving,
@@ -2896,6 +3140,12 @@ function ProjectEditorModal({
   onClose: () => void;
   onSave: () => void;
 }) {
+  const [picker, setPicker] = useState<null | "owner" | "members">(null);
+  const memberLines = () =>
+    draft.members
+      .split("\n")
+      .map((line) => line.trim())
+      .filter(Boolean);
   return (
     <div className="modal-backdrop" role="presentation" onMouseDown={onClose}>
       <div className="modal-card" onMouseDown={(event) => event.stopPropagation()}>
@@ -2927,11 +3177,21 @@ function ProjectEditorModal({
         </div>
         <label>
           <span>项目负责人 userid</span>
-          <input
-            value={draft.owner}
-            onChange={(event) => onChange({ ...draft, owner: event.target.value })}
-            placeholder="例如：zhangsan"
-          />
+          <div className="field-with-action">
+            <input
+              value={draft.owner}
+              onChange={(event) => onChange({ ...draft, owner: event.target.value })}
+              placeholder="例如：zhangsan"
+            />
+            <button
+              type="button"
+              className="ghost-button"
+              onClick={() => setPicker("owner")}
+              disabled={saving}
+            >
+              从企微选择
+            </button>
+          </div>
           <small>任务群创建时自动把负责人拉进群；请确保该成员在自建应用可见范围内。</small>
         </label>
         <label>
@@ -2942,8 +3202,16 @@ function ProjectEditorModal({
             onChange={(event) => onChange({ ...draft, members: event.target.value })}
             placeholder={"zhangsan\nlisi\nwangwu"}
           />
-          <small>userid 在企业微信管理后台「通讯录」成员详情中查看；推送任务时会逐人发送应用消息。</small>
+          <small>推送任务时会逐人发送应用消息；可从企业微信通讯录选择或手动填写。</small>
         </label>
+        <button
+          type="button"
+          className="ghost-button"
+          onClick={() => setPicker("members")}
+          disabled={saving}
+        >
+          从企微选择总群成员
+        </button>
         <label>
           <span>备注</span>
           <textarea
@@ -2960,6 +3228,32 @@ function ProjectEditorModal({
           </button>
         </div>
       </div>
+      {picker === "owner" && (
+        <WecomUserPickerModal
+          mode="single"
+          selected={draft.owner ? [draft.owner.trim()] : []}
+          onClose={() => setPicker(null)}
+          onConfirm={(userids) => {
+            onChange({ ...draft, owner: userids[0] ?? "" });
+            setPicker(null);
+          }}
+        />
+      )}
+      {picker === "members" && (
+        <WecomUserPickerModal
+          mode="multi"
+          selected={memberLines()}
+          onClose={() => setPicker(null)}
+          onConfirm={(userids) => {
+            const merged = [...memberLines()];
+            for (const userid of userids) {
+              if (!merged.includes(userid)) merged.push(userid);
+            }
+            onChange({ ...draft, members: merged.join("\n") });
+            setPicker(null);
+          }}
+        />
+      )}
     </div>
   );
 }
diff --git a/app/api/action/route.ts b/app/api/action/route.ts
index 175322f..6d358f1 100644
--- a/app/api/action/route.ts
+++ b/app/api/action/route.ts
@@ -43,6 +43,7 @@ import {
   sendWecomAppMessage,
   sendWecomRobotMessage,
   listExternalContacts,
+  listInternalContacts,
   WecomClientError,
   type WecomBindings,
 } from "../../../lib/wecom-client";
@@ -683,6 +684,12 @@ export async function POST(request: Request) {
       );
       const contacts = await listExternalContacts(wecomConfig);
       return Response.json({ contacts });
+    } else if (body.action === "wecom_list_internal_contacts") {
+      const wecomConfig = resolveWecomConfig(
+        env as unknown as WecomBindings,
+      );
+      const contacts = await listInternalContacts(wecomConfig);
+      return Response.json({ contacts });
     } else if (body.action === "wecom_sync_group_chats") {
       const wecomConfig = resolveWecomConfig(
         env as unknown as WecomBindings,
diff --git a/app/globals.css b/app/globals.css
index 30af4f8..43e6604 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -5432,3 +5432,18 @@ label small {
     flex-direction: column;
   }
 }
+
+.field-with-action {
+  display: flex;
+  gap: 8px;
+  align-items: center;
+}
+
+.field-with-action > input {
+  flex: 1 1 auto;
+  min-width: 0;
+}
+
+.field-with-action > button {
+  flex: 0 0 auto;
+}
diff --git a/lib/wecom-client.ts b/lib/wecom-client.ts
index 5f2b534..930f4b1 100644
--- a/lib/wecom-client.ts
+++ b/lib/wecom-client.ts
@@ -767,3 +767,124 @@ export async function sendAppChatMessage(
   );
 }
 
+async function getWecomJson(
+  config: WecomConfig,
+  path: string,
+  params: Record<string, string>,
+  errorLabel: string,
+  fetchImpl: FetchLike,
+): Promise<Record<string, unknown>> {
+  if (!hasAppCredentials(config)) {
+    throw new WecomClientError(
+      "企业微信自建应用未配置（WECOM_CORP_ID / WECOM_AGENT_ID / WECOM_SECRET）",
+      400,
+    );
+  }
+  const token = await fetchAccessToken(config, fetchImpl);
+  const query = new URLSearchParams({ access_token: token, ...params });
+  const response = await fetchImpl(`${WECOM_API_ORIGIN}${path}?${query}`, {
+    method: "GET",
+    signal: AbortSignal.timeout(12_000),
+  });
+  const payload = await readEnvelope(response, errorLabel);
+  if (!response.ok) {
+    throw new WecomClientError(`${errorLabel}（HTTP ${response.status}）`, 502);
+  }
+  ensureOk(payload, errorLabel);
+  return payload as Record<string, unknown>;
+}
+
+export type WecomInternalContact = {
+  userid: string;
+  name: string;
+  departmentNames: string[];
+};
+
+const INTERNAL_CONTACT_DEPARTMENT_LIMIT = 100;
+const INTERNAL_CONTACT_CURSOR_ROUNDS = 10;
+
+export async function listInternalContacts(
+  config: WecomConfig,
+  fetchImpl: FetchLike = fetch,
+): Promise<WecomInternalContact[]> {
+  const deptPayload = await getWecomJson(
+    config,
+    "/cgi-bin/department/list",
+    {},
+    "获取企业微信部门列表失败",
+    fetchImpl,
+  );
+  const departments = (
+    Array.isArray(deptPayload.department)
+      ? (deptPayload.department as { id?: unknown; name?: unknown }[])
+      : []
+  ).slice(0, INTERNAL_CONTACT_DEPARTMENT_LIMIT);
+  const departmentNames = new Map<string, string>();
+  for (const dept of departments) {
+    const id = String(dept?.id ?? "");
+    if (id) departmentNames.set(id, bindingValue(dept?.name));
+  }
+
+  const contacts = new Map<string, WecomInternalContact>();
+  for (const dept of departments) {
+    const departmentId = String(dept?.id ?? "");
+    if (!departmentId) continue;
+    let cursor = "";
+    for (let round = 0; round < INTERNAL_CONTACT_CURSOR_ROUNDS; round += 1) {
+      const params: Record<string, string> = {
+        department_id: departmentId,
+        fetch_child: "0",
+      };
+      if (cursor) params.cursor = cursor;
+      const payload = await getWecomJson(
+        config,
+        "/cgi-bin/user/simplelist",
+        params,
+        "获取企业微信部门成员失败",
+        fetchImpl,
+      );
+      const userlist = Array.isArray(payload.userlist)
+        ? (payload.userlist as {
+            userid?: unknown;
+            name?: unknown;
+            department?: unknown[];
+          }[])
+        : [];
+      for (const user of userlist) {
+        const userid = bindingValue(user?.userid);
+        if (!userid) continue;
+        const name = bindingValue(user?.name);
+        const deptIds = (
+          Array.isArray(user?.department)
+            ? user.department.map((id) => String(id)).filter(Boolean)
+            : [departmentId]
+        );
+        const existing = contacts.get(userid);
+        if (existing) {
+          if (!existing.name && name) existing.name = name;
+          for (const deptId of deptIds) {
+            const deptName = departmentNames.get(deptId);
+            if (deptName && !existing.departmentNames.includes(deptName)) {
+              existing.departmentNames.push(deptName);
+            }
+          }
+        } else {
+          contacts.set(userid, {
+            userid,
+            name,
+            departmentNames: deptIds
+              .map((id) => departmentNames.get(id))
+              .filter((deptName): deptName is string => Boolean(deptName)),
+          });
+        }
+      }
+      const nextCursor = bindingValue(payload.next_cursor);
+      if (!nextCursor || nextCursor === cursor) break;
+      cursor = nextCursor;
+    }
+  }
+  return [...contacts.values()].sort((a, b) =>
+    `${a.name}${a.userid}`.localeCompare(`${b.name}${b.userid}`, "zh"),
+  );
+}
+
diff --git a/tests/wecom-client.test.mjs b/tests/wecom-client.test.mjs
index 93d14af..d3dbef7 100644
--- a/tests/wecom-client.test.mjs
+++ b/tests/wecom-client.test.mjs
@@ -10,6 +10,7 @@ import {
   getAppChat,
   listCustomerGroupChats,
   listExternalContacts,
+  listInternalContacts,
   resolveWecomConfig,
   sendAppChatMessage,
   sendWecomAppMessage,
@@ -57,6 +58,56 @@ function fakeWecom(options = {}) {
         invaliduser: invalid.join("|"),
       });
     }
+    if (url.pathname.endsWith("/cgi-bin/department/list")) {
+      if (options.departmentErrcode) {
+        return Response.json({
+          errcode: options.departmentErrcode,
+          errmsg: "not allow to access from your ip",
+        });
+      }
+      return Response.json({
+        errcode: 0,
+        errmsg: "ok",
+        department: options.departments ?? [
+          { id: 1, name: "总办" },
+          { id: 2, name: "运营部" },
+        ],
+      });
+    }
+    if (url.pathname.endsWith("/cgi-bin/user/simplelist")) {
+      const departmentId = url.searchParams.get("department_id") ?? "";
+      const cursor = url.searchParams.get("cursor") ?? "";
+      const table = options.departmentUsers ?? {
+        "1": [
+          { userid: "zhangsan", name: "张三", department: [1, 2] },
+          { userid: "lisi", name: "李四", department: [1] },
+        ],
+        "2": [
+          { userid: "zhangsan", name: "张三", department: [1, 2] },
+          { userid: "wangwu", name: "王五", department: [2] },
+        ],
+      };
+      if (options.paginateSimplelist && departmentId === "1") {
+        if (!cursor) {
+          return Response.json({
+            errcode: 0,
+            errmsg: "ok",
+            userlist: table[departmentId] ?? [],
+            next_cursor: "cursor-2",
+          });
+        }
+        return Response.json({
+          errcode: 0,
+          errmsg: "ok",
+          userlist: [{ userid: "pagetwo", name: "第二页", department: [1] }],
+        });
+      }
+      return Response.json({
+        errcode: 0,
+        errmsg: "ok",
+        userlist: table[departmentId] ?? [],
+      });
+    }
     return new Response("not found", { status: 404 });
   };
   return { calls, fetchImpl };
@@ -947,3 +998,61 @@ test("sendAppChatMessage throws WecomClientError when provider errors", async ()
     },
   );
 });
+
+test("listInternalContacts merges departments, dedupes and maps dept names", async () => {
+  const { calls, fetchImpl } = fakeWecom();
+  const contacts = await listInternalContacts(
+    resolveWecomConfig(baseBindings),
+    fetchImpl,
+  );
+  assert.deepEqual(
+    contacts.map((contact) => `${contact.name}:${contact.userid}`),
+    ["李四:lisi", "王五:wangwu", "张三:zhangsan"],
+    "deduped and sorted by name (zh)",
+  );
+  const zhangsan = contacts.find((contact) => contact.userid === "zhangsan");
+  assert.deepEqual(zhangsan.departmentNames.sort(), ["总办", "运营部"]);
+  const simplelistCalls = calls.filter((call) =>
+    call.url.pathname.endsWith("/cgi-bin/user/simplelist"),
+  );
+  assert.deepEqual(
+    simplelistCalls
+      .map((call) => call.url.searchParams.get("department_id"))
+      .sort(),
+    ["1", "2"],
+    "one simplelist call per department",
+  );
+  assert.ok(
+    simplelistCalls.every((call) => call.url.searchParams.get("fetch_child") === "0"),
+  );
+});
+
+test("listInternalContacts follows simplelist cursor pages", async () => {
+  const { fetchImpl } = fakeWecom({ paginateSimplelist: true });
+  const contacts = await listInternalContacts(
+    resolveWecomConfig(baseBindings),
+    fetchImpl,
+  );
+  assert.ok(contacts.some((contact) => contact.userid === "pagetwo"));
+});
+
+test("listInternalContacts throws WecomClientError on department errcode", async () => {
+  const { fetchImpl } = fakeWecom({ departmentErrcode: 60020 });
+  await assert.rejects(
+    () => listInternalContacts(resolveWecomConfig(baseBindings), fetchImpl),
+    (error) =>
+      error instanceof WecomClientError && /部门列表/.test(error.message),
+  );
+});
+
+test("listInternalContacts rejects without app credentials", async () => {
+  const { fetchImpl } = fakeWecom();
+  await assert.rejects(
+    () =>
+      listInternalContacts(
+        resolveWecomConfig({ ...baseBindings, WECOM_SECRET: "" }),
+        fetchImpl,
+      ),
+    /未配置/,
+  );
+});