diff --git a/src/main/java/com/sztzjy/linkCommerce/service/impl/AiTrainingEvaluationServiceImpl.java b/src/main/java/com/sztzjy/linkCommerce/service/impl/AiTrainingEvaluationServiceImpl.java
index dddc697..2024178 100644
--- a/src/main/java/com/sztzjy/linkCommerce/service/impl/AiTrainingEvaluationServiceImpl.java
+++ b/src/main/java/com/sztzjy/linkCommerce/service/impl/AiTrainingEvaluationServiceImpl.java
@@ -21,6 +21,8 @@ import org.apache.commons.lang3.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.support.TransactionTemplate;
 
 import java.util.Date;
 import java.util.UUID;
@@ -44,6 +46,8 @@ public class AiTrainingEvaluationServiceImpl implements AiTrainingEvaluationServ
     public TeachingClassStudentMapper teachingClassStudentMapper;
     @Autowired
     public QwenChatClient qwenChatClient;
+    @Autowired
+    public PlatformTransactionManager assessmentCompletionTransactionManager;
 
     @Override
     public AiTrainingEvaluationView get(String taskKey, JwtUser user) {
@@ -116,8 +120,7 @@ public class AiTrainingEvaluationServiceImpl implements AiTrainingEvaluationServ
             completed.setAssessmentModel("qwen");
             completed.setAssessmentCompletedAt(completedAt);
             completed.setUpdateTime(completedAt);
-            aiTrainingEvaluationMapper.completeAssessment(completed);
-            studentTrainingAnswerMapper.updateAiAssessmentScore(context.answer.getId(), score, completedAt);
+            completeAssessmentAndWriteScore(completed, context.answer.getId(), score, completedAt);
             completed.setHelpStatus(evaluation.getHelpStatus());
             completed.setAssessmentStatus(SUCCEEDED);
             return toView(completed);
@@ -142,6 +145,22 @@ public class AiTrainingEvaluationServiceImpl implements AiTrainingEvaluationServ
         return new EvaluationContext(task, member.getTeachingClassId(), answer);
     }
 
+    private void completeAssessmentAndWriteScore(AiTrainingEvaluation completed,
+                                                 String answerId,
+                                                 int score,
+                                                 Date completedAt) {
+        TransactionTemplate transactionTemplate = new TransactionTemplate(assessmentCompletionTransactionManager);
+        transactionTemplate.execute(status -> {
+            if (aiTrainingEvaluationMapper.completeAssessment(completed) != 1) {
+                throw new IllegalStateException("Could not complete AI assessment");
+            }
+            if (studentTrainingAnswerMapper.updateAiAssessmentScore(answerId, score, completedAt) != 1) {
+                throw new IllegalStateException("Could not save AI assessment score");
+            }
+            return null;
+        });
+    }
+
     private AiTrainingEvaluation getOrCreate(EvaluationContext context, JwtUser user) {
         AiTrainingEvaluation evaluation = aiTrainingEvaluationMapper.findByStudentClassAndTask(
                 user.getUserId(), context.teachingClassId, context.task.getId());
diff --git a/src/test/java/com/sztzjy/linkCommerce/service/impl/AiTrainingEvaluationServiceImplTest.java b/src/test/java/com/sztzjy/linkCommerce/service/impl/AiTrainingEvaluationServiceImplTest.java
index ecaeec1..d87dd0a 100644
--- a/src/test/java/com/sztzjy/linkCommerce/service/impl/AiTrainingEvaluationServiceImplTest.java
+++ b/src/test/java/com/sztzjy/linkCommerce/service/impl/AiTrainingEvaluationServiceImplTest.java
@@ -14,6 +14,10 @@ import com.sztzjy.linkCommerce.config.exception.handler.ServiceException;
 import com.sztzjy.linkCommerce.config.security.JwtUser;
 import org.junit.jupiter.api.Test;
 import org.mockito.ArgumentCaptor;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.TransactionDefinition;
+import org.springframework.transaction.TransactionStatus;
+import org.springframework.transaction.support.SimpleTransactionStatus;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
@@ -72,6 +76,8 @@ class AiTrainingEvaluationServiceImplTest {
                 .thenReturn(null, evaluation);
         when(service.aiTrainingEvaluationMapper.claimAssessment(eq("evaluation-1"), any(Date.class))).thenReturn(1);
         when(service.qwenChatClient.completeJson(any(), any())).thenReturn(assessmentJson());
+        when(service.aiTrainingEvaluationMapper.completeAssessment(any(AiTrainingEvaluation.class))).thenReturn(1);
+        when(service.studentTrainingAnswerMapper.updateAiAssessmentScore(eq("answer-1"), eq(86), any(Date.class))).thenReturn(1);
 
         AiTrainingEvaluationView view = service.generateAssessment("new-product-survey", student());
 
@@ -79,6 +85,43 @@ class AiTrainingEvaluationServiceImplTest {
         verify(service.studentTrainingAnswerMapper).updateAiAssessmentScore(eq("answer-1"), eq(86), any(Date.class));
     }
 
+    @Test
+    void assessmentScoreWriteFailureRollsBackCompletionAndLeavesEvaluationRetryable() throws Exception {
+        AiTrainingEvaluationServiceImpl service = serviceWithContext(answer("answer-1", "step one", null, null, null));
+        AiTrainingEvaluation evaluation = evaluation("NOT_STARTED", "NOT_STARTED");
+        RecordingTransactionManager transactionManager = new RecordingTransactionManager(evaluation);
+        service.assessmentCompletionTransactionManager = transactionManager;
+        when(service.aiTrainingEvaluationMapper.findByStudentClassAndTask("stu-1", "class-1", "task-1"))
+                .thenReturn(null, evaluation);
+        when(service.aiTrainingEvaluationMapper.claimAssessment(eq("evaluation-1"), any(Date.class))).thenAnswer(invocation -> {
+            evaluation.setAssessmentStatus("PROCESSING");
+            return 1;
+        });
+        when(service.qwenChatClient.completeJson(any(), any())).thenAnswer(invocation -> {
+            assertTrue(!transactionManager.transactionActive);
+            return assessmentJson();
+        });
+        when(service.aiTrainingEvaluationMapper.completeAssessment(any(AiTrainingEvaluation.class))).thenAnswer(invocation -> {
+            evaluation.setAssessmentStatus("SUCCEEDED");
+            return 1;
+        });
+        when(service.studentTrainingAnswerMapper.updateAiAssessmentScore(eq("answer-1"), eq(86), any(Date.class)))
+                .thenThrow(new IllegalStateException("score write failed"));
+        when(service.aiTrainingEvaluationMapper.failAssessment(eq("evaluation-1"), any(), any(Date.class))).thenAnswer(invocation -> {
+            if ("PROCESSING".equals(evaluation.getAssessmentStatus())) {
+                evaluation.setAssessmentStatus("FAILED");
+                return 1;
+            }
+            return 0;
+        });
+
+        assertThrows(ServiceException.class, () -> service.generateAssessment("new-product-survey", student()));
+
+        assertEquals("FAILED", evaluation.getAssessmentStatus());
+        assertTrue(!"SUCCEEDED".equals(evaluation.getAssessmentStatus()));
+        assertTrue(transactionManager.rollbackCalled);
+    }
+
     @Test
     void assessmentRejectsInvalidCriteriaTotal() {
         AiTrainingEvaluationServiceImpl service = serviceWithContext(answer("answer-1", "step one", null, null, null));
@@ -216,6 +259,9 @@ class AiTrainingEvaluationServiceImplTest {
         service.studentTrainingAnswerMapper = mock(StudentTrainingAnswerMapper.class);
         service.teachingClassStudentMapper = mock(TeachingClassStudentMapper.class);
         service.qwenChatClient = mock(QwenChatClient.class);
+        service.assessmentCompletionTransactionManager = mock(PlatformTransactionManager.class);
+        when(service.assessmentCompletionTransactionManager.getTransaction(any(TransactionDefinition.class)))
+                .thenReturn(new SimpleTransactionStatus());
         when(service.trainingTaskMapper.selectByTaskKey("new-product-survey")).thenReturn(task());
         TeachingClassStudent member = new TeachingClassStudent();
         member.setTeachingClassId("class-1");
@@ -224,6 +270,34 @@ class AiTrainingEvaluationServiceImplTest {
         return service;
     }
 
+    private static class RecordingTransactionManager implements PlatformTransactionManager {
+        private final AiTrainingEvaluation evaluation;
+        private boolean transactionActive;
+        private boolean rollbackCalled;
+
+        private RecordingTransactionManager(AiTrainingEvaluation evaluation) {
+            this.evaluation = evaluation;
+        }
+
+        @Override
+        public TransactionStatus getTransaction(TransactionDefinition definition) {
+            transactionActive = true;
+            return new SimpleTransactionStatus();
+        }
+
+        @Override
+        public void commit(TransactionStatus status) {
+            transactionActive = false;
+        }
+
+        @Override
+        public void rollback(TransactionStatus status) {
+            transactionActive = false;
+            rollbackCalled = true;
+            evaluation.setAssessmentStatus("PROCESSING");
+        }
+    }
+
     private TrainingTask task() {
         TrainingTask task = new TrainingTask();
         task.setId("task-1");