diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index a4a7fb5..7c67abd 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -1,7 +1,7 @@
 import { decode } from "js-base64";
 import { getConfig } from "./store";
-import { Dayjs } from "dayjs"
-import { Attachment, File as FileModel } from "./model";
+import dayjs, { Dayjs } from "dayjs"
+import { Assignment, AssignmentDate, Attachment, File as FileModel } from "./model";
 
 export function formatDate(inputDate: string | undefined | null): string {
     if (!inputDate) {
@@ -113,4 +113,29 @@ export function attachmentToFile(attachment: Attachment) {
         size: attachment.size,
         mime_class: attachment.mime_class,
     } as FileModel;
+}
+
+export function getBaseDate(dates: AssignmentDate[]) {
+    return dates.find(date => date.base);
+}
+
+export function assignmentIsEnded(assignment: Assignment) {
+    const baseDate = getBaseDate(assignment.all_dates);
+    const dued = dayjs(baseDate?.due_at).isBefore(dayjs());
+    const locked = dayjs(baseDate?.lock_at).isBefore(dayjs());
+    return dued || locked;
+}
+
+export function assignmentIsNotUnlocked(assignment: Assignment) {
+    const baseDate = getBaseDate(assignment.all_dates);
+    if (!baseDate?.unlock_at) {
+        return false;
+    }
+    const locked = dayjs(baseDate.unlock_at).isAfter(dayjs());
+    return locked;
+}
+
+export function assignmentNotNeedSubmit(assignment: Assignment) {
+    return !assignment.submission ||
+        assignment.submission_types.includes("none") || assignment.submission_types.includes("not_graded");
 }
\ No newline at end of file
diff --git a/src/page/assignments.tsx b/src/page/assignments.tsx
index 8482e1b..e11c540 100644
--- a/src/page/assignments.tsx
+++ b/src/page/assignments.tsx
@@ -2,9 +2,9 @@ import { Avatar, Button, Checkbox, CheckboxProps, Divider, List, Space, Table, T
 import BasicLayout from "../components/layout";
 import useMessage from "antd/es/message/useMessage";
 import { useEffect, useState } from "react";
-import { Assignment, AssignmentDate, Attachment, Course, GradeStatus, Submission, User } from "../lib/model";
+import { Assignment, Attachment, Course, GradeStatus, Submission, User } from "../lib/model";
 import { invoke } from "@tauri-apps/api";
-import { attachmentToFile, formatDate } from "../lib/utils";
+import { assignmentIsEnded, assignmentNotNeedSubmit, attachmentToFile, formatDate, getBaseDate } from "../lib/utils";
 import CourseSelect from "../components/course_select";
 import { usePreview } from "../lib/hooks";
 import dayjs from "dayjs";
@@ -95,20 +95,6 @@ export default function AssignmentsPage() {
         }
     }
 
-    const assignmentIsEnded = (assignment: Assignment) => {
-        const baseDate = getBaseDate(assignment.all_dates);
-        const dued = dayjs(baseDate?.due_at).isBefore(dayjs());
-        const locked = dayjs(baseDate?.lock_at).isBefore(dayjs());
-        return dued || locked;
-    }
-
-    const assignmentNotNeedSubmit = (assignment: Assignment) => {
-        return !assignment.submission ||
-            assignment.submission_types.includes("none") || assignment.submission_types.includes("not_graded");
-    }
-
-    const getBaseDate = (dates: AssignmentDate[]) => dates.find(date => date.base);
-
     const getColumns = () => {
         const columns = [{
             title: '作业名',
diff --git a/src/page/qrcode.tsx b/src/page/qrcode.tsx
index 740ab90..ccb393e 100644
--- a/src/page/qrcode.tsx
+++ b/src/page/qrcode.tsx
@@ -1,4 +1,4 @@
-import { Card, Image, Space } from "antd";
+import { Card, Image, List, Space } from "antd";
 import BasicLayout from "../components/layout";
 import CourseSelect from "../components/course_select";
 import { useEffect, useState } from "react";
@@ -62,14 +62,17 @@ export function QRCodePage() {
             <CourseSelect onChange={handleCourseSelect} disabled={operating} courses={courses} />
             {
                 scanResults.length > 0 &&
-                scanResults.map(scanResult => {
-                    return <Card
-                        hoverable
-                        cover={<Image src={scanResult.file.url} />}
-                    >
-                        <Meta title={scanResult.file.display_name} />
-                    </Card>;
-                })
+                <List grid={{ gutter: 16, column: 4 }} style={{ width: "100%" }} dataSource={scanResults}
+                    renderItem={scanResult => <List.Item>
+                        <Card
+                            hoverable
+                            cover={<Image src={scanResult.file.url} />}
+                        >
+                            <Meta title={scanResult.file.display_name} />
+                        </Card>
+
+                    </List.Item>}>
+                </List>
             }
             {scanResults.length === 0 && <Empty />}
         </Space>
diff --git a/src/page/submissions.tsx b/src/page/submissions.tsx
index d73bba7..378ac2c 100644
--- a/src/page/submissions.tsx
+++ b/src/page/submissions.tsx
@@ -1,15 +1,16 @@
 import { Button, Input, Select, Space, Table, Tag } from "antd";
 import BasicLayout from "../components/layout";
 import useMessage from "antd/es/message/useMessage";
-import { ReactNode, useEffect, useState } from "react";
+import { ReactNode, useEffect, useMemo, useState } from "react";
 import { Assignment, Attachment, Course, FileDownloadTask, GradeStatistic, Submission, User } from "../lib/model";
 import { invoke } from "@tauri-apps/api";
-import { attachmentToFile, formatDate } from "../lib/utils";
+import { assignmentIsNotUnlocked, attachmentToFile, formatDate } from "../lib/utils";
 import CourseSelect from "../components/course_select";
 import FileDownloadTable from "../components/file_download_table";
 import GradeStatisticChart from "../components/grade_statistic";
 import { usePreview } from "../lib/hooks";
 import CommentPanel from "../components/comment_panel";
+import { WarningOutlined } from "@ant-design/icons"
 
 export default function SubmissionsPage() {
     const [messageApi, contextHolder] = useMessage();
@@ -24,13 +25,14 @@ export default function SubmissionsPage() {
     const [downloadTasks, setDownloadTasks] = useState<FileDownloadTask[]>([]);
     const [selectedAssignment, setSelectedAssignment] = useState<Assignment | undefined>(undefined);
     const [selectedAttachments, setSelectedAttachments] = useState<Attachment[]>([]);
-    const usersMap = new Map<number, User>(users.map(user => ([user.id, user])));
+    const usersMap = useMemo(() => new Map<number, User>(users.map(user => ([user.id, user]))), [users]);
     const [statistic, setStatistic] = useState<GradeStatistic | undefined>(undefined);
     const [keyword, setKeyword] = useState<string>("");
     const [attachmentToComment, setAttachmentToComment] = useState<number>(-1);
     const [expandedRowKeys, setExpandedRowKeys] = useState<number[]>([]);
     const [previewFooter, setPreviewFooter] = useState<ReactNode>(undefined);
     const [commentingWhilePreviewing, setCommentingWhilePreviewing] = useState<boolean>(false);
+    const [notSubmitStudents, setNotSubmitStudents] = useState<User[]>([]);
 
     const refreshSubmission = async (studentId: number) => {
         const submission = await invoke("get_single_course_assignment_submission", {
@@ -94,6 +96,12 @@ export default function SubmissionsPage() {
         setEntries(attachments.map(attachmentToFile));
     }, [attachments]);
 
+    useEffect(() => {
+        if (attachments.length > 0) {
+            setNotSubmitStudents(getNotSubmitStudents());
+        }
+    }, [attachments])
+
     const validateGrade = (grade: string) => {
         if (grade.length === 0) {
             return true;
@@ -309,7 +317,6 @@ export default function SubmissionsPage() {
 
     const handleAssignmentSelect = (assignmentId: number) => {
         setStatistic(undefined);
-        setAttachments([]);
         setSelectedAttachments([]);
         let assignment = assignments.find(assignment => assignment.id === assignmentId);
         if (assignment) {
@@ -341,8 +348,35 @@ export default function SubmissionsPage() {
         }
     }
 
+    const getNotSubmitStudents = () => {
+        const notSubmitStudentsMap = new Map<number, User>();
+        usersMap.forEach(user => {
+            notSubmitStudentsMap.set(user.id, user);
+        });
+        attachments.forEach(attachment => {
+            notSubmitStudentsMap.delete(attachment.user_id);
+        });
+        return [...notSubmitStudentsMap.values()].filter(student => student.name !== "测验学生");
+    }
+
+    const getAssignmentTag = (assignment: Assignment) => {
+        const count = assignment.needs_grading_count ?? 0;
+        const notUnlocked = assignmentIsNotUnlocked(assignment);
+        if (notUnlocked) {
+            return <Tag color="geekblue">尚未解锁</Tag>
+        }
+        if (count === 0) {
+            return <Tag color="success">暂无待批改</Tag>
+        }
+
+        return <Tag color="warning" icon={<WarningOutlined />}>{count}份待批改</Tag>
+    }
+
     const assignmentOptions = assignments.map(assignment => ({
-        label: assignment.name,
+        label: <Space>
+            <span>{assignment.name}</span>
+            {getAssignmentTag(assignment)}
+        </Space>,
         value: assignment.id,
     }));
 
@@ -372,6 +406,16 @@ export default function SubmissionsPage() {
                 selectedAssignment?.points_possible &&
                 <span>满分：<b>{selectedAssignment.points_possible}</b>分</span>
             }
+            {
+                attachments.length > 0 && notSubmitStudents.length > 0 && <Space wrap>
+                    未提交学生: {notSubmitStudents.map(s => <Tag>{s.name}</Tag>)}
+                </Space>
+            }
+            {
+                attachments.length === 0 && <Space wrap>
+                    未提交学生: <Tag>暂无任何提交</Tag>
+                </Space>
+            }
             {statistic && <GradeStatisticChart statistic={statistic} />}
             <Input.Search placeholder="输入学生姓名关键词" onSearch={setKeyword} />
             <Table style={{ width: "100%" }}