diff --git a/README.md b/README.md
index a1c2b14..a91a916 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@
 - 学生端和教师端都能直接看到全部组及成员的学号、姓名，无需点开详情。
 - 教师可切换“当前开放登录班级”，未开放班级不能登录。
 - 教师可停止/恢复学生分组操作。
+- 教师可在“学生账号”页签中修改指定学生的登录密码；修改后该学生已有会话会退出。
 - 停止后学生只能查看；教师仍可手工建组、改名、设组长、加入、移出、解散。
 - 教师可导出当前班分组为 `.xlsx`。
 
diff --git a/group_system/http/api.py b/group_system/http/api.py
index 5ff8a6d..f1e0231 100644
--- a/group_system/http/api.py
+++ b/group_system/http/api.py
@@ -183,6 +183,17 @@ class GroupRequestHandler:
             status = HTTPStatus.OK if ok else HTTPStatus.BAD_REQUEST
             return json_response(status, {"ok": ok, "message": message})
 
+        if action == "teacher/student-password" and method == "POST":
+            session, error = self.require_teacher()
+            if error:
+                return error
+            data = self.read_json()
+            ok, message = self.store.teacher_set_student_password(
+                int(data.get("student_id", 0)), data.get("new_password", "")
+            )
+            status = HTTPStatus.OK if ok else HTTPStatus.BAD_REQUEST
+            return json_response(status, {"ok": ok, "message": message})
+
         if action == "teacher/group-limit" and method == "POST":
             _, error = self.require_teacher()
             if error:
diff --git a/group_system/storage/accounts.py b/group_system/storage/accounts.py
index f250c91..8fd9f26 100644
--- a/group_system/storage/accounts.py
+++ b/group_system/storage/accounts.py
@@ -136,6 +136,30 @@ class AccountStoreMixin:
                 )
         return True, "密码修改成功"
 
+    def teacher_set_student_password(
+        self, student_id: int, new_password: str
+    ) -> tuple[bool, str]:
+        """教师后台重置指定学生的登录密码。"""
+        new_password = new_password or ""
+        if len(new_password) < 8:
+            return False, "新密码至少 8 位"
+        with self.lock, self.connection:
+            student = self.connection.execute(
+                "SELECT student_no FROM students WHERE id=?", (student_id,)
+            ).fetchone()
+            if student is None:
+                return False, "学生不存在"
+            if new_password == student["student_no"]:
+                return False, "新密码不能设置为学号"
+            self.connection.execute(
+                "UPDATE students SET password_hash=?, must_change_password=0 WHERE id=?",
+                (hash_password(new_password), student_id),
+            )
+            self.connection.execute(
+                "DELETE FROM sessions WHERE student_id=?", (student_id,)
+            )
+        return True, f"已修改 {student['student_no']} 的密码"
+
     def get_student(self, student_id: int) -> dict[str, Any] | None:
         with self.lock:
             row = self.connection.execute("SELECT * FROM students WHERE id=?", (student_id,)).fetchone()
diff --git a/static/style.css b/static/style.css
index a507dfb..f768c01 100644
--- a/static/style.css
+++ b/static/style.css
@@ -124,6 +124,14 @@ h3 { margin: 0; font-size: 17px; }
 .import-label:hover { background: #e2e8f0; }
 .settings-divider { height: 1px; margin: 26px 0 22px; background: var(--border); }
 .settings-password-line { margin-top: 14px; }
+.student-search { max-width: 560px; }
+.student-search + .account-password-form { margin-top: 14px; }
+.account-password-form {
+  display: grid; grid-template-columns: max-content minmax(220px, 340px);
+  gap: 12px 14px; align-items: center; max-width: 560px;
+}
+.account-password-form .field-label { color: var(--muted); font-size: 14px; font-weight: 600; }
+.account-password-form button { grid-column: 2; justify-self: start; }
 
 .grid {
   display: grid; grid-template-columns: repeat(auto-fill,minmax(290px,1fr)); gap: 16px;
@@ -185,6 +193,8 @@ h3 { margin: 0; font-size: 17px; }
   .admin-tab { min-width: 96px; height: 38px; font-size: 13px; }
   .class-panel, .import-label, .create-group-line { margin-bottom: 14px; }
   .form-line { flex-direction: column; align-items: stretch; }
+  .account-password-form { grid-template-columns: 1fr; }
+  .account-password-form button { grid-column: auto; justify-self: stretch; }
   .form-line button, .form-line span { width: 100%; text-align: center; }
   .form-line span { height: auto; color: var(--muted); font-size: 13px; }
 }
diff --git a/static/teacher.html b/static/teacher.html
index d7e7f51..69f7417 100644
--- a/static/teacher.html
+++ b/static/teacher.html
@@ -50,6 +50,7 @@
       <nav class="admin-tabs" role="tablist" aria-label="教师管理功能">
         <button class="admin-tab active" id="groupsTab" data-tab="groups" aria-controls="groupsPanel" aria-selected="true" type="button">小组管理</button>
         <button class="admin-tab" id="ungroupedTab" data-tab="ungrouped" aria-controls="ungroupedPanel" aria-selected="false" type="button">未分组学生</button>
+        <button class="admin-tab" id="accountsTab" data-tab="accounts" aria-controls="accountsPanel" aria-selected="false" type="button">学生账号</button>
         <button class="admin-tab" id="settingsTab" data-tab="settings" aria-controls="settingsPanel" aria-selected="false" type="button">设置与安全</button>
       </nav>
 
@@ -71,6 +72,25 @@
         <div id="ungroupedList"></div>
       </section>
 
+      <section class="panel tab-panel hidden" id="accountsPanel" role="tabpanel" aria-labelledby="accountsTab">
+        <div class="section-head"><h2>修改学生密码</h2></div>
+        <div class="student-search">
+          <label class="field-label" for="studentNoSearch">搜索学号</label>
+          <input id="studentNoSearch" type="search" autocomplete="off" placeholder="输入部分学号筛选学生">
+        </div>
+        <form class="account-password-form" id="studentPasswordForm">
+          <label class="field-label" for="studentSelect">学生</label>
+          <select id="studentSelect" required aria-label="选择学生"></select>
+          <label class="field-label" for="studentNewPassword">新密码</label>
+          <input id="studentNewPassword" type="password" autocomplete="new-password" minlength="8" placeholder="至少 8 位" required>
+          <label class="field-label" for="studentConfirmPassword">确认新密码</label>
+          <input id="studentConfirmPassword" type="password" autocomplete="new-password" minlength="8" placeholder="再次输入新密码" required>
+          <button data-working type="submit">修改密码</button>
+        </form>
+        <div class="notice" id="studentPasswordNotice"></div>
+        <p class="hint">修改后请把新密码告知学生；该学生的所有已登录会话会立即退出。</p>
+      </section>
+
       <section class="panel tab-panel hidden" id="settingsPanel" role="tabpanel" aria-labelledby="settingsTab">
         <div class="section-head"><h2>设置与安全</h2></div>
         <h3>分组上限</h3>
diff --git a/static/teacher.js b/static/teacher.js
index 41f0e59..93be01a 100644
--- a/static/teacher.js
+++ b/static/teacher.js
@@ -1,6 +1,6 @@
 const state = { classes: [], snapshot: null, activeClass: '', username: '' };
 const el = id => document.getElementById(id);
-const adminTabs = ['groups', 'ungrouped', 'settings'];
+const adminTabs = ['groups', 'ungrouped', 'accounts', 'settings'];
 
 function renderUnauthenticated() {
   el('loginArea').classList.remove('hidden');
@@ -28,6 +28,56 @@ function renderState() {
   renderStatistics();
   renderGroups();
   renderUngrouped();
+  renderStudentAccounts();
+}
+
+function allStudents() {
+  return [
+    ...state.snapshot.groups.flatMap(group => group.members),
+    ...state.snapshot.ungrouped
+  ].sort((left, right) => String(left.student_no).localeCompare(String(right.student_no), 'zh-Hans-CN'));
+}
+
+function renderStudentAccounts() {
+  const keyword = el('studentNoSearch').value.trim().toLocaleLowerCase();
+  const students = allStudents().filter(student =>
+    String(student.student_no).toLocaleLowerCase().includes(keyword)
+  );
+  const select = el('studentSelect');
+  const previous = select.value;
+  select.innerHTML = students.length ? students.map(student => `
+    <option value="${student.id}">${text(student.student_no)} · ${text(student.name)}</option>
+  `).join('') : '<option value="">未找到匹配的学号</option>';
+  if (students.some(student => String(student.id) === previous)) {
+    select.value = previous;
+  }
+}
+
+async function submitStudentPassword(event) {
+  event.preventDefault();
+  const notice = el('studentPasswordNotice');
+  const select = el('studentSelect');
+  const student = allStudents().find(item => String(item.id) === select.value);
+  const newPassword = el('studentNewPassword').value;
+  const confirmPassword = el('studentConfirmPassword').value;
+  notice.textContent = '';
+  if (!student) {
+    notice.textContent = '请选择要修改密码的学生';
+    return;
+  }
+  if (newPassword !== confirmPassword) {
+    notice.textContent = '两次输入的新密码不一致';
+    return;
+  }
+  if (!requireConfirm(`确定修改 ${student.student_no} ${student.name} 的登录密码吗？修改后该学生需要重新登录。`)) return;
+  setButtonsDisabled(el('studentPasswordForm'), true);
+  const result = await api('teacher/student-password', {
+    method: 'POST', json: { student_id: Number(select.value), new_password: newPassword }
+  });
+  setButtonsDisabled(el('studentPasswordForm'), false);
+  notice.textContent = result.ok ? '' : result.message;
+  toast(result.message, !result.ok);
+  if (result.ok) el('studentPasswordForm').reset();
 }
 
 document.querySelectorAll('.admin-tab').forEach(button => {
@@ -263,6 +313,8 @@ async function logout() {
 
 el('loginForm').addEventListener('submit', submitLogin);
 el('teacherPasswordForm').addEventListener('submit', submitTeacherPassword);
+el('studentPasswordForm').addEventListener('submit', submitStudentPassword);
+el('studentNoSearch').addEventListener('input', renderStudentAccounts);
 el('groupLimitForm').addEventListener('submit', submitGroupLimit);
 el('logoutButton').addEventListener('click', logout);
 el('lockButton').addEventListener('click', toggleLock);