diff --git a/backend/services/homework_service.py b/backend/services/homework_service.py
index eb57aba..125893e 100644
--- a/backend/services/homework_service.py
+++ b/backend/services/homework_service.py
@@ -109,11 +109,23 @@ class HomeworkService:
             # 创建扣分记录
             student = await StudentModel.get_by_id(submission["student_id"])
             if student:
+                # 检查分数是否会超出范围（防止溢出）
+                current_points = student.get("total_points", 0)
+                new_points = current_points + points_change
+                if new_points < 0:
+                    return {"success": False, "message": f"分数不能为负（当前{current_points}，扣{abs(points_change)}）"}
+                
+                # 获取操作人姓名
+                from models.user import UserModel
+                user = await UserModel.get_by_user_id(operator_id)
+                recorder_name = user.get("real_name", "班主任") if user else "班主任"
+                
                 await ConductModel.create_record(
                     student_id=submission["student_id"],
                     points_change=points_change,
                     reason=f"作业未提交/迟交: {submission['title']}",
                     recorder_id=operator_id,
+                    recorder_name=recorder_name,
                     related_type="homework",
                     related_id=submission["assignment_id"]
                 )
diff --git a/frontend/admin/conduct.php b/frontend/admin/conduct.php
index 7c26be5..8c9ed29 100644
--- a/frontend/admin/conduct.php
+++ b/frontend/admin/conduct.php
@@ -106,7 +106,7 @@ async function exportConductRecords() {
     showToast('正在导出...', 'info');
     
     try {
-        const params = { page: 1, page_size: 10000 };
+        const params = { page: 1, page_size: 1000 };
         if (startDate) params.start_date = startDate;
         if (endDate) params.end_date = endDate;
         
diff --git a/frontend/student/dashboard.php b/frontend/student/dashboard.php
index 2f353ca..67e6d39 100644
--- a/frontend/student/dashboard.php
+++ b/frontend/student/dashboard.php
@@ -88,6 +88,10 @@ include __DIR__ . '/../includes/header.php';
                 <div class="stat-label">当前操行分</div>
                 <div class="stat-value" id="totalPoints">--</div>
             </div>
+            <div class="stat-card">
+                <div class="stat-label">班级排名</div>
+                <div class="stat-value" id="studentRank">--</div>
+            </div>
             <div class="stat-card">
                 <div class="stat-label">作业完成率</div>
                 <div class="stat-value" id="homeworkRate">--%</div>
@@ -291,6 +295,18 @@ include __DIR__ . '/../includes/header.php';
                 document.getElementById('recentRecords').innerHTML = html;
             }
             
+            // 获取班级排名
+            const rankingRes = await apiGet('/api/student/ranking', { limit: 100 });
+            if (rankingRes && rankingRes.success) {
+                const ranking = rankingRes.data.ranking || [];
+                const rank = ranking.find(s => s.student_id === parseInt(STUDENT_ID));
+                if (rank) {
+                    document.getElementById('studentRank').textContent = `第${rank.rank}名 / ${ranking.length}人`;
+                } else {
+                    document.getElementById('studentRank').textContent = '--';
+                }
+            }
+            
             // 获取作业统计
             const homeworkRes = await apiGet(`/api/student/homework/${STUDENT_ID}`);
             if (homeworkRes && homeworkRes.success) {