diff --git a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/DBVersionMapper.java b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/DBVersionMapper.java
index 023fe2c4..0340168f 100644
--- a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/DBVersionMapper.java
+++ b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/DBVersionMapper.java
@@ -3,10 +3,29 @@ package com.roomroot.jwgl.mapper;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.roomroot.jwgl.entity.DBVersion;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.time.LocalDateTime;
 
 /**
  * DBVersion Mapper
+ *
+ * 注意：DBVersion 表与部分列为混合大小写标识符，且该表按"最大 ID=当前版本"
+ * 保留历史记录，禁止用 MyBatis-Plus 自动生成的 select/insert/update
+ * （约定列名与真实列名不符），必须走本接口的显式 XML 语句。
  */
 @Mapper
 public interface DBVersionMapper extends BaseMapper<DBVersion> {
+
+    /** 当前生效配置：最大 ID 行。 */
+    DBVersion selectCurrent();
+
+    /** 版本表为空时写入第一条设置记录，未提供字段走数据库默认值。 */
+    int insertInitialSettings(@Param("dto") DBVersion dto,
+                              @Param("versionDate") LocalDateTime versionDate,
+                              @Param("versionValue") String versionValue);
+
+    /** 复制当前版本整行并覆盖本次提供的设置字段，形成新版本。 */
+    int insertNextSettingsVersion(@Param("dto") DBVersion dto,
+                                  @Param("versionDate") LocalDateTime versionDate);
 }
diff --git a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/DBVersionMapper.xml b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/DBVersionMapper.xml
index 02b62f86..29c9a1b7 100644
--- a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/DBVersionMapper.xml
+++ b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/DBVersionMapper.xml
@@ -43,12 +43,126 @@
         <result column="三实课标记" property="sSKBJ" />
         <result column="增加学时标记" property="zJXSBJ" />
         <result column="减少学时标记" property="jSXSBJ" />
-        <result column="JSONZD" property="jsonZD" />
+        <result column="json字典" property="jsonZD" />
         <result column="学员正课请假模板文件编号" property="xYZKQJMBWJBH" />
     </resultMap>
 
     <sql id="Base_Column_List">
-ID, VersionDate, VersionValue, UniversityName, 学员队全名称含年级, 学期名称样式, 节次类别, 外部文件存储根路径, 本站文件访问路径, 登录失败弹窗, 允许密码尝试次数, 用户锁定分钟数, 允许教研室管理教材, 使用虚拟教学场地设置班次专用教室, 使用虚拟教员设置课程责任教员, 允许多主讲分组教学, 跟查课录入锁定天数, UniversityCode, UniversityValidCode, 显示78节, 显示晚上, 显示夜间, 教学要点名称, 教材导出包含图片, 建立班次学期信息时自动生成教学计划, 成绩报表显示结论成绩, 缺省系统名称, Excel课表按开课日期排序, Excel课表显示实施教员数, 系统模式, 课程表标题样式, 课程表副标题样式, 大屏显示教学内容, 大屏显示前景标题颜色, 大屏显示前景内容颜色, 大屏显示背景颜色, 实践课标记, 三实课标记, 增加学时标记, 减少学时标记, JSONZD, 学员正课请假模板文件编号
+"ID", "VersionDate", "VersionValue", "UniversityName", 学员队全名称含年级, 学期名称样式, 节次类别, 外部文件存储根路径, 本站文件访问路径, 登录失败弹窗, 允许密码尝试次数, 用户锁定分钟数, 允许教研室管理教材, 使用虚拟教学场地设置班次专用教室, 使用虚拟教员设置课程责任教员, 允许多主讲分组教学, 跟查课录入锁定天数, "UniversityCode", "UniversityValidCode", 显示78节, 显示晚上, 显示夜间, 教学要点名称, 教材导出包含图片, 建立班次学期信息时自动生成教学计划, 成绩报表显示结论成绩, 缺省系统名称, "Excel课表按开课日期排序", "Excel课表显示实施教员数", 系统模式, 课程表标题样式, 课程表副标题样式, 大屏显示教学内容, 大屏显示前景标题颜色, 大屏显示前景内容颜色, 大屏显示背景颜色, 实践课标记, 三实课标记, 增加学时标记, 减少学时标记, "json字典", "学员正课请假模板文件编号"
     </sql>
 
+    <!-- 当前生效配置：版本表保留历史，最大 ID 行为当前版本。 -->
+    <select id="selectCurrent" resultMap="BaseResultMap">
+        SELECT
+        <include refid="Base_Column_List"/>
+        FROM "DBVersion"
+        WHERE "ID" = (
+            SELECT MAX("ID") FROM "DBVersion"
+        )
+    </select>
+
+    <!-- 版本表为空时写入第一条设置记录；未提供字段走数据库默认值。 -->
+    <insert id="insertInitialSettings">
+        INSERT INTO "DBVersion" (
+            "ID", "VersionDate", "VersionValue"
+            <if test="dto.XS78J != null">, "显示78节"</if>
+            <if test="dto.XSWS != null">, "显示晚上"</if>
+            <if test="dto.XSYJ != null">, "显示夜间"</if>
+            <if test="dto.JXYDMC != null">, "教学要点名称"</if>
+        )
+        SELECT 1, #{versionDate}, #{versionValue}
+            <if test="dto.XS78J != null">, #{dto.XS78J}</if>
+            <if test="dto.XSWS != null">, #{dto.XSWS}</if>
+            <if test="dto.XSYJ != null">, #{dto.XSYJ}</if>
+            <if test="dto.JXYDMC != null">, #{dto.JXYDMC}</if>
+        FROM DUAL
+        WHERE NOT EXISTS (
+            SELECT 1 FROM "DBVersion"
+        )
+    </insert>
+
+    <!-- 复制当前版本整行并覆盖本次提供的设置字段，形成新版本，不原地改历史行。 -->
+    <insert id="insertNextSettingsVersion">
+        INSERT INTO "DBVersion" (
+            "ID", "VersionDate", "VersionValue", "UniversityName",
+            "学员队全名称含年级", "学期名称样式", "节次类别",
+            "外部文件存储根路径", "本站文件访问路径",
+            "登录失败弹窗", "允许密码尝试次数", "用户锁定分钟数",
+            "允许教研室管理教材",
+            "使用虚拟教学场地设置班次专用教室",
+            "使用虚拟教员设置课程责任教员",
+            "允许多主讲分组教学", "跟查课录入锁定天数",
+            "UniversityCode", "UniversityValidCode",
+            "显示78节", "显示晚上", "显示夜间", "教学要点名称",
+            "教材导出包含图片",
+            "建立班次学期信息时自动生成教学计划",
+            "成绩报表显示结论成绩", "缺省系统名称",
+            "Excel课表按开课日期排序", "Excel课表显示实施教员数",
+            "系统模式", "课程表标题样式", "课程表副标题样式",
+            "大屏显示教学内容", "大屏显示前景标题颜色",
+            "大屏显示前景内容颜色", "大屏显示背景颜色",
+            "实践课标记", "三实课标记", "增加学时标记",
+            "减少学时标记", "json字典", "学员正课请假模板文件编号"
+        )
+        SELECT
+            currentVersion."ID" + 1,
+            #{versionDate},
+            currentVersion."VersionValue",
+            currentVersion."UniversityName",
+            currentVersion."学员队全名称含年级",
+            currentVersion."学期名称样式",
+            currentVersion."节次类别",
+            currentVersion."外部文件存储根路径",
+            currentVersion."本站文件访问路径",
+            currentVersion."登录失败弹窗",
+            currentVersion."允许密码尝试次数",
+            currentVersion."用户锁定分钟数",
+            currentVersion."允许教研室管理教材",
+            currentVersion."使用虚拟教学场地设置班次专用教室",
+            currentVersion."使用虚拟教员设置课程责任教员",
+            currentVersion."允许多主讲分组教学",
+            currentVersion."跟查课录入锁定天数",
+            currentVersion."UniversityCode",
+            currentVersion."UniversityValidCode",
+            <choose>
+                <when test="dto.XS78J != null">#{dto.XS78J}</when>
+                <otherwise>currentVersion."显示78节"</otherwise>
+            </choose>,
+            <choose>
+                <when test="dto.XSWS != null">#{dto.XSWS}</when>
+                <otherwise>currentVersion."显示晚上"</otherwise>
+            </choose>,
+            <choose>
+                <when test="dto.XSYJ != null">#{dto.XSYJ}</when>
+                <otherwise>currentVersion."显示夜间"</otherwise>
+            </choose>,
+            <choose>
+                <when test="dto.JXYDMC != null">#{dto.JXYDMC}</when>
+                <otherwise>currentVersion."教学要点名称"</otherwise>
+            </choose>,
+            currentVersion."教材导出包含图片",
+            currentVersion."建立班次学期信息时自动生成教学计划",
+            currentVersion."成绩报表显示结论成绩",
+            currentVersion."缺省系统名称",
+            currentVersion."Excel课表按开课日期排序",
+            currentVersion."Excel课表显示实施教员数",
+            currentVersion."系统模式",
+            currentVersion."课程表标题样式",
+            currentVersion."课程表副标题样式",
+            currentVersion."大屏显示教学内容",
+            currentVersion."大屏显示前景标题颜色",
+            currentVersion."大屏显示前景内容颜色",
+            currentVersion."大屏显示背景颜色",
+            currentVersion."实践课标记",
+            currentVersion."三实课标记",
+            currentVersion."增加学时标记",
+            currentVersion."减少学时标记",
+            currentVersion."json字典",
+            currentVersion."学员正课请假模板文件编号"
+        FROM "DBVersion" currentVersion
+        WHERE currentVersion."ID" = (
+            SELECT MAX("ID") FROM "DBVersion"
+        )
+    </insert>
+
 </mapper>
diff --git a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/SystemInitializationMapper.xml b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/SystemInitializationMapper.xml
index 82d2d990..5cef1fe4 100644
--- a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/SystemInitializationMapper.xml
+++ b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/mapper/SystemInitializationMapper.xml
@@ -179,7 +179,7 @@
             "大屏显示教学内容", "大屏显示前景标题颜色",
             "大屏显示前景内容颜色", "大屏显示背景颜色",
             "实践课标记", "三实课标记", "增加学时标记",
-            "减少学时标记", "JSONZD", "学员正课请假模板文件编号"
+            "减少学时标记", "json字典", "学员正课请假模板文件编号"
         )
         SELECT
             currentVersion."ID" + 1,
@@ -222,7 +222,7 @@
             currentVersion."三实课标记",
             currentVersion."增加学时标记",
             currentVersion."减少学时标记",
-            currentVersion."JSONZD",
+            currentVersion."json字典",
             currentVersion."学员正课请假模板文件编号"
         FROM "DBVersion" currentVersion
         WHERE currentVersion."ID" = #{dto.expectedVersionId}
diff --git a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/SystemSettingsServiceImpl.java b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/SystemSettingsServiceImpl.java
index d08e017e..94406ad1 100644
--- a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/SystemSettingsServiceImpl.java
+++ b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/SystemSettingsServiceImpl.java
@@ -1,60 +1,41 @@
 package com.roomroot.jwgl.service.impl;
 
-import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.roomroot.jwgl.entity.DBVersion;
 import com.roomroot.jwgl.mapper.DBVersionMapper;
 import com.roomroot.jwgl.service.SystemSettingsService;
-import com.roomroot.jwgl.utils.UuidUtil;
 import jakarta.annotation.Resource;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.time.LocalDateTime;
+
 /**
- * 教务系统参数实现：DBVersion 单行 get-or-create，更新仅写非空字段。
+ * 教务系统参数实现：DBVersion 按"最大 ID=当前版本"读取，
+ * 更新复制当前行生成新版本（保留历史），仅覆盖非空字段。
  */
 @Service
 public class SystemSettingsServiceImpl implements SystemSettingsService {
 
+    private static final String INITIAL_VERSION_VALUE = "1";
+
     @Resource
     private DBVersionMapper dbVersionMapper;
 
     @Override
     public DBVersion get() {
-        DBVersion row = dbVersionMapper.selectOne(
-                new LambdaQueryWrapper<DBVersion>().last("LIMIT 1"));
+        DBVersion row = dbVersionMapper.selectCurrent();
         return row == null ? new DBVersion() : row;
     }
 
     @Transactional(rollbackFor = Exception.class)
     @Override
     public DBVersion update(DBVersion settings) {
-        DBVersion row = dbVersionMapper.selectOne(
-                new LambdaQueryWrapper<DBVersion>().last("LIMIT 1"));
-        if (row == null) {
-            row = new DBVersion();
-            row.setXYZKQJMBWJBH(UuidUtil.getUUID());
-            apply(row, settings);
-            dbVersionMapper.insert(row);
-            return row;
-        }
-        apply(row, settings);
-        dbVersionMapper.updateById(row);
-        return row;
-    }
-
-    /** 只写非空字段，避免前端局部提交清空其它参数 */
-    private void apply(DBVersion row, DBVersion src) {
-        if (src.getXS78J() != null) {
-            row.setXS78J(src.getXS78J());
-        }
-        if (src.getXSWS() != null) {
-            row.setXSWS(src.getXSWS());
-        }
-        if (src.getXSYJ() != null) {
-            row.setXSYJ(src.getXSYJ());
-        }
-        if (src.getJXYDMC() != null) {
-            row.setJXYDMC(src.getJXYDMC());
+        LocalDateTime now = LocalDateTime.now();
+        if (dbVersionMapper.selectCurrent() == null) {
+            dbVersionMapper.insertInitialSettings(settings, now, INITIAL_VERSION_VALUE);
+        } else {
+            dbVersionMapper.insertNextSettingsVersion(settings, now);
         }
+        return get();
     }
 }