diff --git a/safety-cedu-service/src/main/java/org/qinan/cedu/mapper/PaperExamQuestionUserMapper.java b/safety-cedu-service/src/main/java/org/qinan/cedu/mapper/PaperExamQuestionUserMapper.java
index 1c44ebd1..64f784d5 100644
--- a/safety-cedu-service/src/main/java/org/qinan/cedu/mapper/PaperExamQuestionUserMapper.java
+++ b/safety-cedu-service/src/main/java/org/qinan/cedu/mapper/PaperExamQuestionUserMapper.java
@@ -4,6 +4,7 @@ import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 import org.qinan.cedu.model.entity.PaperExamQuestionUserDO;
+import org.qinan.cedu.model.vo.PaperExamQuestionStatVO;
 
 import java.math.BigDecimal;
 
@@ -20,4 +21,12 @@ public interface PaperExamQuestionUserMapper extends BaseMapper<PaperExamQuestio
      * @return 作答总得分（无记录时返回0）
      */
     BigDecimal sumAnswerScore(@Param("paperExamId") Long paperExamId);
+
+    /**
+     * 一条SQL统计一次考试的总题数与答对题数（未作答按错误计）
+     *
+     * @param paperExamId 考试记录id
+     * @return 总题数与答对题数（聚合查询恒返回一条记录）
+     */
+    PaperExamQuestionStatVO countTotalAndCorrect(@Param("paperExamId") Long paperExamId);
 }
diff --git a/safety-cedu-service/src/main/java/org/qinan/cedu/model/vo/PaperExamQuestionStatVO.java b/safety-cedu-service/src/main/java/org/qinan/cedu/model/vo/PaperExamQuestionStatVO.java
new file mode 100644
index 00000000..8f772b90
--- /dev/null
+++ b/safety-cedu-service/src/main/java/org/qinan/cedu/model/vo/PaperExamQuestionStatVO.java
@@ -0,0 +1,17 @@
+package org.qinan.cedu.model.vo;
+
+import io.swagger.annotations.ApiModelProperty;
+import lombok.Data;
+
+/**
+ * 考试试题作答统计结果
+ */
+@Data
+public class PaperExamQuestionStatVO {
+
+    @ApiModelProperty("总题数")
+    private Long total;
+
+    @ApiModelProperty("答对题数")
+    private Long correct;
+}
diff --git a/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/PaperExamServiceImpl.java b/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/PaperExamServiceImpl.java
index 2d1d08ca..41d58edf 100644
--- a/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/PaperExamServiceImpl.java
+++ b/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/PaperExamServiceImpl.java
@@ -25,6 +25,7 @@ import org.qinan.cedu.model.entity.PaperDO;
 import org.qinan.cedu.model.entity.PaperExamDO;
 import org.qinan.cedu.model.entity.PaperExamQuestionUserDO;
 import org.qinan.cedu.model.entity.QuestionDO;
+import org.qinan.cedu.model.vo.PaperExamQuestionStatVO;
 import org.qinan.cedu.model.vo.PaperExamVO;
 import org.qinan.cedu.model.vo.StartExamQuestionVO;
 import org.qinan.cedu.model.vo.StartExamVO;
@@ -239,14 +240,10 @@ public class PaperExamServiceImpl extends ServiceImpl<PaperExamMapper, PaperExam
         if (examRecord == null) {
             return;
         }
-        // 统计总题数与答对题数，错误题数=总题数-答对题数（未作答按错误计），正确率=答对/总数*100
-        long total = paperExamQuestionUserService.count(new LambdaQueryWrapper<PaperExamQuestionUserDO>()
-                .eq(PaperExamQuestionUserDO::getPaperExamId, paperExam.getId())
-                .eq(PaperExamQuestionUserDO::getDeleteEnum, DeleteEnum.FALSE.getCode()));
-        long correct = paperExamQuestionUserService.count(new LambdaQueryWrapper<PaperExamQuestionUserDO>()
-                .eq(PaperExamQuestionUserDO::getPaperExamId, paperExam.getId())
-                .eq(PaperExamQuestionUserDO::getDeleteEnum, DeleteEnum.FALSE.getCode())
-                .eq(PaperExamQuestionUserDO::getRightStatus, BooleanQAEnum.TRUE.getValue()));
+        // 一条统计SQL取总题数与答对题数，错误题数=总题数-答对题数（未作答按错误计），正确率=答对/总数*100
+        PaperExamQuestionStatVO stat = paperExamQuestionUserMapper.countTotalAndCorrect(paperExam.getId());
+        long total = stat.getTotal();
+        long correct = stat.getCorrect();
         examRecord.setScore(examScore);
         examRecord.setPassed(paperExam.getPassed());
         examRecord.setWrongCount((int) (total - correct));
diff --git a/safety-cedu-service/src/main/resources/mapper/PaperExamQuestionUserMapper.xml b/safety-cedu-service/src/main/resources/mapper/PaperExamQuestionUserMapper.xml
index b1001894..9fee7514 100644
--- a/safety-cedu-service/src/main/resources/mapper/PaperExamQuestionUserMapper.xml
+++ b/safety-cedu-service/src/main/resources/mapper/PaperExamQuestionUserMapper.xml
@@ -8,4 +8,12 @@
         WHERE paper_exam_id = #{paperExamId}
         AND delete_enum = 'false'
     </select>
+
+    <select id="countTotalAndCorrect" resultType="org.qinan.cedu.model.vo.PaperExamQuestionStatVO">
+        SELECT COUNT(*) AS total,
+               IFNULL(SUM(CASE WHEN right_status = 'true' THEN 1 ELSE 0 END), 0) AS correct
+        FROM paper_exam_question_user
+        WHERE paper_exam_id = #{paperExamId}
+        AND delete_enum = 'false'
+    </select>
 </mapper>