diff --git a/src/main/java/cn/wepact/dfm/training/mapper/SyncUserInfoLogMapper.java b/src/main/java/cn/wepact/dfm/training/mapper/SyncUserInfoLogMapper.java
index d6332f0..2ec121f 100644
--- a/src/main/java/cn/wepact/dfm/training/mapper/SyncUserInfoLogMapper.java
+++ b/src/main/java/cn/wepact/dfm/training/mapper/SyncUserInfoLogMapper.java
@@ -6,6 +6,7 @@ import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 
 import java.util.Date;
+import java.util.List;
 @Mapper
 public interface SyncUserInfoLogMapper extends MyBatisBaseMapper<SyncUserInfoLog, Long> {
 
@@ -22,4 +23,6 @@ public interface SyncUserInfoLogMapper extends MyBatisBaseMapper<SyncUserInfoLog
 
     void updateLastSyncTime(Date date);
     SyncUserInfoLog findUserInfoByStuUserId(@Param("stuUserId") String stuUserId);
+
+    List<SyncUserInfoLog> batchFindUserInfoByStuUserIds(@Param("stuUserIds") List<String> stuUserIds);
 }
diff --git a/src/main/java/cn/wepact/dfm/training/mapper/SyncUserInfoLogMapper.xml b/src/main/java/cn/wepact/dfm/training/mapper/SyncUserInfoLogMapper.xml
index d86ce09..a900ad7 100644
--- a/src/main/java/cn/wepact/dfm/training/mapper/SyncUserInfoLogMapper.xml
+++ b/src/main/java/cn/wepact/dfm/training/mapper/SyncUserInfoLogMapper.xml
@@ -150,4 +150,11 @@
     <select id="findUserInfoByStuUserId" resultMap="UserResultMap">
         SELECT user_id, username FROM sync_user_info_log WHERE user_id = #{stuUserId}
     </select>
+
+    <select id="batchFindUserInfoByStuUserIds" resultMap="UserResultMap">
+        SELECT user_id, username FROM sync_user_info_log WHERE user_id IN
+        <foreach collection="stuUserIds" item="stuUserId" open="(" separator="," close=")">
+            #{stuUserId}
+        </foreach>
+    </select>
 </mapper>
diff --git a/src/main/java/cn/wepact/dfm/training/mapper/TUserMapper.java b/src/main/java/cn/wepact/dfm/training/mapper/TUserMapper.java
index 437da6a..4d558c2 100644
--- a/src/main/java/cn/wepact/dfm/training/mapper/TUserMapper.java
+++ b/src/main/java/cn/wepact/dfm/training/mapper/TUserMapper.java
@@ -22,4 +22,11 @@ public interface TUserMapper extends MyBatisBaseMapper<TUser, Long> {
      */
 
     Long findUserIdByUsername(@Param("username") String username);
+
+    /**
+     * 批量查询用户ID（替代 N+1 循环查询）
+     * @param usernames 用户名列表
+     * @return username -> userId 映射列表
+     */
+    List<TUser> batchFindUserIdByUsernames(@Param("usernames") List<String> usernames);
 }
diff --git a/src/main/java/cn/wepact/dfm/training/mapper/TUserMapper.xml b/src/main/java/cn/wepact/dfm/training/mapper/TUserMapper.xml
index eaa3379..b94c772 100644
--- a/src/main/java/cn/wepact/dfm/training/mapper/TUserMapper.xml
+++ b/src/main/java/cn/wepact/dfm/training/mapper/TUserMapper.xml
@@ -189,5 +189,12 @@
 
   <select id="findUserIdByUsername" resultType="java.lang.Long">
     SELECT id FROM t_user WHERE user_no = #{username}
-    </select>
+  </select>
+
+  <select id="batchFindUserIdByUsernames" resultType="cn.wepact.dfm.training.dto.entity.TUser">
+    SELECT id, user_no AS userNo FROM t_user WHERE user_no IN
+    <foreach collection="usernames" item="username" open="(" separator="," close=")">
+      #{username}
+    </foreach>
+  </select>
 </mapper>
diff --git a/src/main/java/cn/wepact/dfm/training/service/SyncTaskService.java b/src/main/java/cn/wepact/dfm/training/service/SyncTaskService.java
index c99f389..539e1ec 100644
--- a/src/main/java/cn/wepact/dfm/training/service/SyncTaskService.java
+++ b/src/main/java/cn/wepact/dfm/training/service/SyncTaskService.java
@@ -304,21 +304,51 @@ public class SyncTaskService {
             responseJson = new JSONObject(responseData);
             dataArray = responseJson.getJSONArray("data");
 
+            // 第一遍：收集所有 stuUserId，批量查询用户信息（替代 N+1）
+            List<String> stuUserIds = new ArrayList<>(dataArray.size());
+            for (int i = 0; i < dataArray.size(); i++) {
+                JSONObject taskData = dataArray.getJSONObject(i);
+                String stuUserId = getStringValue(taskData, "stuUserId");
+                if (!stuUserId.isEmpty()) {
+                    stuUserIds.add(stuUserId);
+                }
+            }
+            // 批量查询：sync_user_info_log（stuUserId → username）
+            Map<String, String> stuUserIdToUsername = new HashMap<>();
+            if (!stuUserIds.isEmpty()) {
+                List<SyncUserInfoLog> userInfos = syncUserInfoLogMapper.batchFindUserInfoByStuUserIds(stuUserIds);
+                for (SyncUserInfoLog info : userInfos) {
+                    if (info.getUserId() != null && info.getUsername() != null) {
+                        stuUserIdToUsername.put(info.getUserId(), info.getUsername());
+                    }
+                }
+            }
+            // 批量查询：t_user（username → userId）
+            List<String> usernames = new ArrayList<>(stuUserIdToUsername.values());
+            Map<String, Long> usernameToUserId = new HashMap<>();
+            if (!usernames.isEmpty()) {
+                List<TUser> tUsers = userMapper.batchFindUserIdByUsernames(usernames);
+                for (TUser tUser : tUsers) {
+                    if (tUser.getUserNo() != null) {
+                        usernameToUserId.put(tUser.getUserNo(), tUser.getId());
+                    }
+                }
+            }
+
             for (int i = 0; i < dataArray.size(); i++) {
                 JSONObject taskData = dataArray.getJSONObject(i);
                 // 从任务数据中获取学生用户ID
                 String stuUserId = getStringValue(taskData, "stuUserId");
+                if (stuUserId.isEmpty()) continue;
 
-
-
-                // 1. 获取用户信息：根据云学堂的学生用户ID查询本地用户信息
-                SyncUserInfoLog userInfo = syncUserInfoLogMapper.findUserInfoByStuUserId(stuUserId);
-                if (userInfo == null) {
+                // 1. 从缓存中获取用户信息
+                String username = stuUserIdToUsername.get(stuUserId);
+                if (username == null) {
                     continue; // 如果在本地数据库中找不到对应的用户信息，跳过当前记录的处理
                 }
 
-                // 2. 获取系统内部的user_id：通过用户名查找对应的用户ID
-                Long userId = userMapper.findUserIdByUsername(userInfo.getUsername());
+                // 2. 从缓存中获取系统内部的user_id
+                Long userId = usernameToUserId.get(username);
                 if (userId == null) {
                     continue; // 如果找不到对应的用户ID，跳过当前记录的处理
                 }
@@ -535,15 +565,42 @@ public class SyncTaskService {
     }
 
     public void processTaskScores(List<TaskScoreSummary> taskScoreSummaries) {
+        // 批量查询用户信息缓存（替代 N+1）
+        List<String> stuUserIds = new ArrayList<>(taskScoreSummaries.size());
         for (TaskScoreSummary summary : taskScoreSummaries) {
-            // 1. 获取用户信息
-            SyncUserInfoLog userInfo = syncUserInfoLogMapper.findUserInfoByStuUserId(summary.getStuUserId());
-            if (userInfo == null) {
+            if (summary.getStuUserId() != null) {
+                stuUserIds.add(summary.getStuUserId());
+            }
+        }
+        Map<String, String> stuUserIdToUsername = new HashMap<>();
+        if (!stuUserIds.isEmpty()) {
+            List<SyncUserInfoLog> userInfos = syncUserInfoLogMapper.batchFindUserInfoByStuUserIds(stuUserIds);
+            for (SyncUserInfoLog info : userInfos) {
+                if (info.getUserId() != null && info.getUsername() != null) {
+                    stuUserIdToUsername.put(info.getUserId(), info.getUsername());
+                }
+            }
+        }
+        List<String> usernames = new ArrayList<>(stuUserIdToUsername.values());
+        Map<String, Long> usernameToUserId = new HashMap<>();
+        if (!usernames.isEmpty()) {
+            List<TUser> tUsers = userMapper.batchFindUserIdByUsernames(usernames);
+            for (TUser tUser : tUsers) {
+                if (tUser.getUserNo() != null) {
+                    usernameToUserId.put(tUser.getUserNo(), tUser.getId());
+                }
+            }
+        }
+
+        for (TaskScoreSummary summary : taskScoreSummaries) {
+            // 1. 从缓存中获取用户信息
+            String username = stuUserIdToUsername.get(summary.getStuUserId());
+            if (username == null) {
                 continue; // 如果没有找到用户信息，跳过
             }
 
-            // 2. 获取 user_id
-            Long userId = userMapper.findUserIdByUsername(userInfo.getUsername());
+            // 2. 从缓存中获取 user_id
+            Long userId = usernameToUserId.get(username);
             if (userId == null) {
                 continue; // 如果没有找到用户 ID，跳过
             }
diff --git a/src/main/java/cn/wepact/dfm/training/service/SyncUserInfoService.java b/src/main/java/cn/wepact/dfm/training/service/SyncUserInfoService.java
index db0782f..9355893 100644
--- a/src/main/java/cn/wepact/dfm/training/service/SyncUserInfoService.java
+++ b/src/main/java/cn/wepact/dfm/training/service/SyncUserInfoService.java
@@ -6,6 +6,7 @@ import cn.hutool.json.JSONObject;
 import cn.wepact.dfm.training.dto.SyncRequest;
 import cn.wepact.dfm.training.dto.entity.SyncTaskLog;
 import cn.wepact.dfm.training.dto.entity.SyncUserInfoLog;
+import cn.wepact.dfm.training.dto.entity.TUser;
 import cn.wepact.dfm.training.mapper.SyncUserInfoLogMapper;
 import cn.wepact.dfm.training.mapper.TUserMapper;
 import cn.wepact.dfm.training.util.HttpClientUtil;
@@ -33,8 +34,10 @@ import java.math.BigDecimal;
 import java.sql.Timestamp;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.util.ArrayList;
 import java.util.Date;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 @Service
@@ -199,6 +202,26 @@ public class SyncUserInfoService {
                 return;
             }
 
+            // 第一遍：收集所有用户名，批量查询用户ID（替代 N+1 逐条查询）
+            List<String> usernames = new ArrayList<>(dataArray.size());
+            for (int i = 0; i < dataArray.size(); i++) {
+                JSONObject dataObject = dataArray.getJSONObject(i);
+                if (dataObject == null) continue;
+                String u = getStringValue(dataObject, "username");
+                if (!u.isEmpty()) {
+                    usernames.add(u);
+                }
+            }
+            Map<String, Long> userIdCache = new HashMap<>();
+            if (!usernames.isEmpty()) {
+                List<TUser> tUsers = userMapper.batchFindUserIdByUsernames(usernames);
+                for (TUser tUser : tUsers) {
+                    if (tUser.getUserNo() != null) {
+                        userIdCache.put(tUser.getUserNo(), tUser.getId());
+                    }
+                }
+            }
+
             for (int i = 0; i < dataArray.size(); i++) {
                 JSONObject dataObject = dataArray.getJSONObject(i);
                 if (dataObject == null) {
@@ -213,8 +236,8 @@ public class SyncUserInfoService {
                     continue;
                 }
 
-                // 获取系统内部的user_id
-                Long userId = userMapper.findUserIdByUsername(username);
+                // 从批量查询的缓存中获取系统内部的user_id
+                Long userId = userIdCache.get(username);
                 if (userId == null) {
                     logger.warn("未找到用户: {}", username);
                     continue;
diff --git a/src/main/resources/logback-spring.xml b/src/main/resources/logback-spring.xml
index 7327662..2cae964 100644
--- a/src/main/resources/logback-spring.xml
+++ b/src/main/resources/logback-spring.xml
@@ -79,12 +79,12 @@
     </root>
 
 
-    <!-- 增加SQL打印 -->
-    <logger name="org.apache.ibatis" level="debug">
+    <!-- 增加SQL打印（additivity=false 防止向上传播到 root 导致重复打印） -->
+    <logger name="org.apache.ibatis" level="debug" additivity="false">
         <appender-ref ref="STDOUT"/>
     </logger>
 
-    <logger name="cn.wepact.dfm.training.mapper" level="debug">
+    <logger name="cn.wepact.dfm.training.mapper" level="debug" additivity="false">
         <appender-ref ref="STDOUT"/>
     </logger>
     <!-- 增加SQL打印 end-->