diff --git a/docs/sql/2026-07-30-backfill-school-default-tasks.sql b/docs/sql/2026-07-30-backfill-school-default-tasks.sql
new file mode 100644
index 0000000..08c13fa
--- /dev/null
+++ b/docs/sql/2026-07-30-backfill-school-default-tasks.sql
@@ -0,0 +1,44 @@
+-- 为已有学校补齐学校级默认实训任务；不会覆盖任何学校管理员已保存的默认配置。
+START TRANSACTION;
+
+CREATE TABLE IF NOT EXISTS school_default_task_initialization (
+  school_id varchar(64) NOT NULL,
+  status varchar(16) NOT NULL,
+  last_error varchar(1000) NULL,
+  attempt_count int NOT NULL DEFAULT 0,
+  create_time datetime NOT NULL,
+  update_time datetime NOT NULL,
+  PRIMARY KEY (school_id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='学校默认实训任务初始化状态';
+
+INSERT INTO task_allocation (id, class_id, school_id, module, disabled_status, sort)
+SELECT UUID(), CONCAT('SCHOOL_DEFAULT:', s.school_id), s.school_id, p.module, p.disabled_status, p.sort
+FROM school s
+JOIN task_allocation p ON p.class_id = '999999999'
+WHERE s.school_id <> '999999999'
+  AND NOT EXISTS (
+    SELECT 1
+    FROM task_allocation existing_task
+    WHERE existing_task.class_id = CONCAT('SCHOOL_DEFAULT:', s.school_id)
+  );
+
+INSERT INTO school_default_task_initialization (
+  school_id, status, last_error, attempt_count, create_time, update_time
+)
+SELECT s.school_id, 'READY', NULL, 1, NOW(), NOW()
+FROM school s
+WHERE s.school_id <> '999999999'
+  AND EXISTS (
+    SELECT 1
+    FROM task_allocation default_task
+    WHERE default_task.class_id = CONCAT('SCHOOL_DEFAULT:', s.school_id)
+  )
+ON DUPLICATE KEY UPDATE
+  status = IF(status = 'READY', status, 'READY'),
+  update_time = NOW();
+
+COMMIT;
+
+SELECT school_id, status, attempt_count, update_time
+FROM school_default_task_initialization
+ORDER BY update_time DESC;
diff --git a/src/main/java/com/sztzjy/linkCommerce/controller/stu/TeaScoreController.java b/src/main/java/com/sztzjy/linkCommerce/controller/stu/TeaScoreController.java
index bdcd9d5..1ca3f8e 100644
--- a/src/main/java/com/sztzjy/linkCommerce/controller/stu/TeaScoreController.java
+++ b/src/main/java/com/sztzjy/linkCommerce/controller/stu/TeaScoreController.java
@@ -12,6 +12,7 @@ import com.sztzjy.linkCommerce.mapper.TaskAllocationMapper;
 import com.sztzjy.linkCommerce.mapper.TeachingClassStudentMapper;
 import com.sztzjy.linkCommerce.mapper.WeightMapper;
 import com.sztzjy.linkCommerce.service.ScoreRankService;
+import com.sztzjy.linkCommerce.service.SchoolDefaultTaskService;
 import com.sztzjy.linkCommerce.util.ResultEntity;
 import com.sztzjy.linkCommerce.util.excel.FilePortUtil;
 import io.swagger.annotations.Api;
@@ -49,6 +50,8 @@ public class TeaScoreController {
     TeachingClassStudentMapper teachingClassStudentMapper;
     @Autowired
     TaskAllocationMapper taskAllocationMapper;
+    @Autowired(required = false)
+    SchoolDefaultTaskService schoolDefaultTaskService;
 
     @PostMapping("/selectStuRankAndScore")
     @ApiOperation("查询学生成绩和排名")
@@ -279,12 +282,20 @@ public class TeaScoreController {
     }
 
     private Set<String> resolveEnabledTaskModules(String classId) {
-        if (taskAllocationMapper == null || StringUtils.isBlank(classId)) {
+        if (StringUtils.isBlank(classId)) {
             return Collections.emptySet();
         }
-        List<TaskAllocation> allocations = selectTaskAllocations(classId);
-        if ((allocations == null || allocations.isEmpty()) && !"999999999".equals(classId)) {
-            allocations = selectTaskAllocations("999999999");
+        List<TaskAllocation> allocations;
+        if (schoolDefaultTaskService != null) {
+            allocations = schoolDefaultTaskService.resolveForTeachingClass(classId);
+        } else {
+            if (taskAllocationMapper == null) {
+                return Collections.emptySet();
+            }
+            allocations = selectTaskAllocations(classId);
+            if ((allocations == null || allocations.isEmpty()) && !"999999999".equals(classId)) {
+                allocations = selectTaskAllocations("999999999");
+            }
         }
         return (allocations == null ? Collections.<TaskAllocation>emptyList() : allocations).stream()
                 .filter(allocation -> allocation.getDisabledStatus() == null || allocation.getDisabledStatus() != 1)
diff --git a/src/test/java/com/sztzjy/linkCommerce/controller/stu/TeaScoreControllerProgressTest.java b/src/test/java/com/sztzjy/linkCommerce/controller/stu/TeaScoreControllerProgressTest.java
index 0030781..f6bdb8e 100644
--- a/src/test/java/com/sztzjy/linkCommerce/controller/stu/TeaScoreControllerProgressTest.java
+++ b/src/test/java/com/sztzjy/linkCommerce/controller/stu/TeaScoreControllerProgressTest.java
@@ -9,6 +9,7 @@ import com.sztzjy.linkCommerce.mapper.StuRankMapper;
 import com.sztzjy.linkCommerce.mapper.TaskAllocationMapper;
 import com.sztzjy.linkCommerce.mapper.SchoolClassMapper;
 import com.sztzjy.linkCommerce.service.ScoreRankService;
+import com.sztzjy.linkCommerce.service.SchoolDefaultTaskService;
 import com.sztzjy.linkCommerce.util.ResultEntity;
 import org.junit.jupiter.api.Test;
 import org.springframework.test.util.ReflectionTestUtils;
@@ -62,6 +63,25 @@ class TeaScoreControllerProgressTest {
         assertNull(row.getTrainingProgress());
     }
 
+    @Test
+    void scoreProgressUsesSchoolDefaultResolverWhenTeachingClassHasNoOwnTasks() {
+        TeaScoreController controller = controllerWithMocks();
+        StuRankMapper rankMapper = field(controller, "stuRankMapper");
+        StuGradeMapper gradeMapper = field(controller, "stuGradeMapper");
+        SchoolDefaultTaskService defaultTaskService = mock(SchoolDefaultTaskService.class);
+        ReflectionTestUtils.setField(controller, "schoolDefaultTaskService", defaultTaskService);
+        StuRank rank = rank("student-1", "class-1");
+        when(rankMapper.selectByExample(any())).thenReturn(Collections.singletonList(rank));
+        when(defaultTaskService.resolveForTeachingClass("class-1")).thenReturn(Collections.singletonList(task("学校默认任务", (byte) 0)));
+        when(gradeMapper.selectByExample(any())).thenReturn(Collections.singletonList(grade("学校默认任务")));
+
+        ResultEntity<PageInfo<StuRank>> result = controller.selectStuRankAndScore("class-1", null, null, "school-1", 1, 10);
+        StuRank row = result.getBody().getData().getList().get(0);
+
+        assertEquals(1, row.getTotalTaskCount());
+        assertEquals(new BigDecimal("100.00"), row.getTrainingProgress());
+    }
+
     private TeaScoreController controllerWithMocks() {
         TeaScoreController controller = new TeaScoreController();
         ReflectionTestUtils.setField(controller, "stuRankMapper", mock(StuRankMapper.class));