diff --git a/src/main/java/net/geedge/asw/common/util/RCode.java b/src/main/java/net/geedge/asw/common/util/RCode.java
index 6fd4efa..d43dd33 100644
--- a/src/main/java/net/geedge/asw/common/util/RCode.java
+++ b/src/main/java/net/geedge/asw/common/util/RCode.java
@@ -66,6 +66,7 @@ public enum RCode {
 	GIT_PARENT_COMMITID_NOT_FOUND(203003, "Parent commitId not found"),
 	GIT_BINARY_CONFLICT_ERROR(203004, "Binary file conflict found; resolve conflicts in binary files manually"),
 	GIT_MERGE_NOT_SUPPORTED(203005, "Cannot merge in the {0} state"),
+	GIT_MERGE_TARGET_BRANCH_NOT_EXIST(203006, "The target branch {0} does not exist."),
 
 
 	// Runner
diff --git a/src/main/java/net/geedge/asw/module/app/dao/ApplicationDao.java b/src/main/java/net/geedge/asw/module/app/dao/ApplicationDao.java
deleted file mode 100644
index f1c6954..0000000
--- a/src/main/java/net/geedge/asw/module/app/dao/ApplicationDao.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package net.geedge.asw.module.app.dao;
-
-import com.baomidou.mybatisplus.core.mapper.BaseMapper;
-import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
-import net.geedge.asw.module.app.entity.ApplicationEntity;
-import org.apache.ibatis.annotations.Mapper;
-
-import java.util.List;
-import java.util.Map;
-
-@Mapper
-public interface ApplicationDao extends BaseMapper<ApplicationEntity>{
-
-    List<ApplicationEntity> queryList(Page page, Map<String, Object> params);
-}
diff --git a/src/main/java/net/geedge/asw/module/app/service/IGitService.java b/src/main/java/net/geedge/asw/module/app/service/IGitService.java
index 7fbb532..66ce20e 100644
--- a/src/main/java/net/geedge/asw/module/app/service/IGitService.java
+++ b/src/main/java/net/geedge/asw/module/app/service/IGitService.java
@@ -28,6 +28,8 @@ public interface IGitService {
 
     void deleteBranch(String workspaceId, String branch);
 
+    boolean isBranchExists(String workspaceId, String branch);
+
     List<Map<Object, Object>> listBranchCommit(String workspaceId, String branch, String path);
 
     String getParentCommitId(String workspaceId, String branch, String commitId);
diff --git a/src/main/java/net/geedge/asw/module/app/service/impl/ApplicationMergeServiceImpl.java b/src/main/java/net/geedge/asw/module/app/service/impl/ApplicationMergeServiceImpl.java
index 7d388fa..ef1a408 100644
--- a/src/main/java/net/geedge/asw/module/app/service/impl/ApplicationMergeServiceImpl.java
+++ b/src/main/java/net/geedge/asw/module/app/service/impl/ApplicationMergeServiceImpl.java
@@ -120,8 +120,10 @@ public class ApplicationMergeServiceImpl extends ServiceImpl<ApplicationMergeDao
         switch (mergeRequestStatus) {
             case OPEN: {
                 newCommitId = gitService.getLatestCommitId(workspaceId, sourceBranch);
-                // open 状态下,获取 sourceBranch,targetBranch 冲突文件
-                conflictFileList = gitService.getConflictFilePathInBranches(workspaceId, sourceBranch, targetBranch);
+                if (gitService.isBranchExists(workspaceId, targetBranch)) {
+                    // open 状态下,获取 sourceBranch,targetBranch 冲突文件
+                    conflictFileList = gitService.getConflictFilePathInBranches(workspaceId, sourceBranch, targetBranch);
+                }
                 break;
             }
             case CLOSED:
@@ -231,7 +233,7 @@ public class ApplicationMergeServiceImpl extends ServiceImpl<ApplicationMergeDao
      * merge operation
      *
      * @param mrId
-     * @param action   merge|close
+     * @param action merge|close
      * @return
      */
     @Override
@@ -252,6 +254,11 @@ public class ApplicationMergeServiceImpl extends ServiceImpl<ApplicationMergeDao
                 String message = entity.getTitle();
                 String workspaceId = entity.getWorkspaceId();
 
+                // 检查 tgtBranch 是否存在
+                if (T.BooleanUtil.negate(gitService.isBranchExists(workspaceId, tgtBranch))) {
+                    throw new ASWException(RCode.GIT_MERGE_TARGET_BRANCH_NOT_EXIST.setParam(tgtBranch));
+                }
+
                 // merge
                 try {
                     gitService.mergeBranch(workspaceId, srcBranch, tgtBranch, message, null);
@@ -259,17 +266,17 @@ public class ApplicationMergeServiceImpl extends ServiceImpl<ApplicationMergeDao
                     entity.setEndCommitId(latestCommitId);
                     entity.setStatus(MergeRequestStatus.MERGED.toString());
                 } catch (Exception e) {
-                    log.error(e, "[newMr] [merge error] [workspaceId: {}] [srcBranch: {}] [tgtBranch: {}] [msg: {}]", workspaceId, srcBranch, tgtBranch, e.getMessage());
+                    log.error(e, "[mergeMr] [merge error] [workspaceId: {}] [srcBranch: {}] [tgtBranch: {}] [msg: {}]", workspaceId, srcBranch, tgtBranch, e.getMessage());
                     throw new ASWException(RCode.GIT_MERGE_FAILED.setParam(e.getMessage()));
                 }
 
                 // remove source branch
                 if (1 == entity.getRemoveSourceBranch()) {
                     try {
-                        log.info("[newMr] [remove source branch] [workspaceId: {}] [branch: {}]", workspaceId, srcBranch);
+                        log.info("[mergeMr] [remove source branch] [workspaceId: {}] [branch: {}]", workspaceId, srcBranch);
                         gitService.deleteBranch(workspaceId, srcBranch);
                     } catch (Exception e) {
-                        log.error(e, "[newMr] [remove source branch error] [workspaceId: {}] [branch: {}] [msg: {}]", workspaceId, srcBranch, e.getMessage());
+                        log.error(e, "[mergeMr] [remove source branch error] [workspaceId: {}] [branch: {}] [msg: {}]", workspaceId, srcBranch, e.getMessage());
                     }
                 }
 
@@ -308,6 +315,7 @@ public class ApplicationMergeServiceImpl extends ServiceImpl<ApplicationMergeDao
             public String toString() {
                 return "open";
             }
+
             public boolean canMerge() {
                 return true;
             }
@@ -317,6 +325,7 @@ public class ApplicationMergeServiceImpl extends ServiceImpl<ApplicationMergeDao
             public String toString() {
                 return "merged";
             }
+
             public boolean canMerge() {
                 return false;
             }
@@ -326,6 +335,7 @@ public class ApplicationMergeServiceImpl extends ServiceImpl<ApplicationMergeDao
             public String toString() {
                 return "closed";
             }
+
             public boolean canMerge() {
                 return false;
             }
diff --git a/src/main/java/net/geedge/asw/module/app/service/impl/GitServiceImpl.java b/src/main/java/net/geedge/asw/module/app/service/impl/GitServiceImpl.java
index 01f99ea..d0436cb 100644
--- a/src/main/java/net/geedge/asw/module/app/service/impl/GitServiceImpl.java
+++ b/src/main/java/net/geedge/asw/module/app/service/impl/GitServiceImpl.java
@@ -3,10 +3,14 @@ package net.geedge.asw.module.app.service.impl;
 import cn.dev33.satoken.stp.StpUtil;
 import cn.hutool.json.JSONObject;
 import cn.hutool.log.Log;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import net.geedge.asw.common.util.ASWException;
 import net.geedge.asw.common.util.RCode;
 import net.geedge.asw.common.util.T;
+import net.geedge.asw.module.app.entity.ApplicationMergeEntity;
+import net.geedge.asw.module.app.service.IApplicationMergeService;
 import net.geedge.asw.module.app.service.IGitService;
+import net.geedge.asw.module.app.service.impl.ApplicationMergeServiceImpl.MergeRequestStatus;
 import net.geedge.asw.module.sys.entity.SysUserEntity;
 import net.geedge.asw.module.sys.service.ISysUserService;
 import net.geedge.asw.module.workspace.entity.WorkspaceEntity;
@@ -37,7 +41,6 @@ import org.eclipse.jgit.treewalk.TreeWalk;
 import org.eclipse.jgit.treewalk.filter.PathFilter;
 import org.eclipse.jgit.util.io.DisabledOutputStream;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 
@@ -50,7 +53,6 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.text.MessageFormat;
 import java.util.*;
-import java.util.concurrent.ExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
 
@@ -80,8 +82,7 @@ public class GitServiceImpl implements IGitService {
     private IWorkspaceService workspaceService;
 
     @Autowired
-    @Qualifier("virtualThreadExecutor")
-    private ExecutorService virtualThreadExecutor;
+    private IApplicationMergeService applicationMergeService;
 
     /**
      * is binary file
@@ -257,17 +258,36 @@ public class GitServiceImpl implements IGitService {
 
     @Override
     public void deleteBranch(String workspaceId, String branchName) {
+        log.info("[deleteBranch] [begin] [workspaceId: {}] [branch: {}]", workspaceId, branchName);
         try (Git git = this.getGitInstance(workspaceId)) {
             git.branchDelete()
                     .setBranchNames(branchName)
                     .setForce(true)
                     .call();
+
+            // OPEN 状态，mr 源分支被删除，mr 记录直接删掉
+            applicationMergeService.remove(new LambdaQueryWrapper<ApplicationMergeEntity>()
+                    .eq(ApplicationMergeEntity::getWorkspaceId, workspaceId)
+                    .eq(ApplicationMergeEntity::getSourceBranch, branchName)
+                    .eq(ApplicationMergeEntity::getStatus, MergeRequestStatus.OPEN.toString())
+            );
         } catch (GitAPIException e) {
             log.error(e, "[deleteBranch] [error] [workspaceId: {}] [branchName: {}]", workspaceId, branchName);
             throw new ASWException(RCode.ERROR);
         }
     }
 
+    @Override
+    public boolean isBranchExists(String workspaceId, String branch) {
+        try (Git git = this.getGitInstance(workspaceId)) {
+            Ref ref = git.getRepository().findRef(T.StrUtil.concat(true, LOCAL_BRANCH_PREFIX, branch));
+            return null != ref;
+        } catch (IOException e) {
+            log.error(e, "[isBranchExists] [workspaceId: {}] [branch: {}]", workspaceId, branch);
+            throw new RuntimeException(e);
+        }
+    }
+
     @Override
     public List<Map<Object, Object>> listBranchCommit(String workspaceId, String branch, String path) {
         List<Map<Object, Object>> resultList = T.ListUtil.list(true);
@@ -1228,70 +1248,6 @@ public class GitServiceImpl implements IGitService {
         return result;
     }
 
-    /**
-     * 解决冲突提交到 srcBranch
-     * 提交指定 srcBranch，tgtBranch 最新 commitId,像 merge commit 一样
-     *
-     * @param workspaceId
-     * @param srcBranch
-     * @param tgtBranch
-     * @param commitId
-     * @param commitMessage
-     * @param files
-     */
-//    @Override
-//    public void resolveMrConflicts(String workspaceId, String srcBranch, String tgtBranch, String commitId, String commitMessage, List<Map<String, String>> files) {
-//        try (Git git = this.getGitInstance(workspaceId);
-//             Repository repository = git.getRepository();
-//             TreeWalk treeWalk = new TreeWalk(repository);
-//             RevWalk revWalk = new RevWalk(repository)) {
-//
-//            ObjectId srcBranchLatestCommitId = repository.resolve(srcBranch);
-//
-//            // branch tree
-//            treeWalk.addTree(revWalk.parseTree(srcBranchLatestCommitId));
-//            treeWalk.setRecursive(true);
-//
-//            DirCache newTree = DirCache.newInCore();
-//            DirCacheBuilder newTreeBuilder = newTree.builder();
-//
-//            List<String> updateFilePath = files.stream().map(map -> T.MapUtil.getStr(map, "path")).collect(Collectors.toList());
-//            while (treeWalk.next()) {
-//                String pathString = treeWalk.getPathString();
-//                // 先删
-//                if (!updateFilePath.contains(pathString)) {
-//                    DirCacheEntry entry = new DirCacheEntry(pathString);
-//                    entry.setFileMode(treeWalk.getFileMode(0));
-//                    entry.setObjectId(treeWalk.getObjectId(0));
-//                    newTreeBuilder.add(entry);
-//                }
-//            }
-//            // 后增
-//            for (Map<String, String> map : files) {
-//                String path = T.MapUtil.getStr(map, "path");
-//                DirCacheEntry dirCacheEntry = new DirCacheEntry(path);
-//                dirCacheEntry.setFileMode(FileMode.REGULAR_FILE);
-//
-//                String content = T.MapUtil.getStr(map, "content");
-//                ObjectId objectId = this.insertBlobFileToDatabase(repository, content.getBytes());
-//                dirCacheEntry.setObjectId(objectId);
-//                newTreeBuilder.add(dirCacheEntry);
-//            }
-//            newTreeBuilder.finish();
-//
-//            // merge commit
-//            ObjectId parentId1 = ObjectId.fromString(commitId);
-//            RevCommit revCommit = revWalk.parseCommit(repository.resolve(tgtBranch));
-//            ObjectId parentId2 = revCommit.getId();
-//
-//            boolean success = this.commitIndex(repository, srcBranch, newTree, parentId1, parentId2, commitMessage);
-//            log.info("[resolveMrConflicts] [workspaceId: {}] [srcBranch: {}] [tgtBranch: {}] [commitId: {}] [success: {}]", workspaceId, srcBranch, tgtBranch, commitId, success);
-//        } catch (IOException | ConcurrentRefUpdateException e) {
-//            log.error(e, "[resolveMrConflicts] [error] [workspaceId: {}] [srcBranch: {}] [tgtBranch: {}] [commitId: {}]", workspaceId, srcBranch, tgtBranch, commitId);
-//            throw new RuntimeException(e);
-//        }
-//    }
-
     /**
      * commit
      *
diff --git a/src/main/resources/db/mapper/app/ApplicationMapper.xml b/src/main/resources/db/mapper/app/ApplicationMapper.xml
deleted file mode 100644
index 315215f..0000000
--- a/src/main/resources/db/mapper/app/ApplicationMapper.xml
+++ /dev/null
@@ -1,67 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
-
-<mapper namespace="net.geedge.asw.module.app.dao.ApplicationDao">
-    <resultMap id="appResult" type="net.geedge.asw.module.app.entity.ApplicationEntity">
-        <result property="id" column="id"/>
-        <result property="name" column="name"/>
-        <result property="tags" column="tags"/>
-        <result property="packageName" column="package_name"/>
-        <result property="website" column="website"/>
-        <result property="provider" column="provider"/>
-        <result property="status" column="status"/>
-        <result property="properties" column="properties" typeHandler="com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler"/>
-        <result property="description" column="description"/>
-        <result property="createTimestamp" column="create_timestamp"/>
-        <result property="updateTimestamp" column="update_timestamp"/>
-        <result property="createUserId" column="create_user_id"/>
-        <result property="updateUserId" column="update_user_id"/>
-        <result property="workspaceId" column="workspace_id"/>
-        <result property="opVersion" column="op_version"/>
-
-        <association property="createUser" columnPrefix="cu_" javaType="net.geedge.asw.module.sys.entity.SysUserEntity">
-            <id property="id" column="id"/>
-            <result property="name" column="name"/>
-            <result property="userName" column="user_name"/>
-        </association>
-
-        <association property="updateUser" columnPrefix="uu_" javaType="net.geedge.asw.module.sys.entity.SysUserEntity">
-            <id property="id" column="id"/>
-            <result property="name" column="name"/>
-            <result property="userName" column="user_name"/>
-        </association>
-    </resultMap>
-
-    <select id="queryList" resultMap="appResult">
-        SELECT
-        app.*,
-        cu.id as cu_id,
-        cu.name as cu_name,
-        cu.user_name as cu_user_name,
-        uu.id as uu_id,
-        uu.name as uu_name,
-        uu.user_name as uu_user_name
-        FROM
-        application app
-        left join sys_user cu on app.create_user_id = cu.id
-        left join sys_user uu on app.update_user_id = uu.id
-        <where>
-            <if test="params.ids != null and params.ids != ''">
-                app.id in
-                <foreach item="id" collection="params.ids.split(',')" separator="," open="(" close=")">
-                    #{id}
-                </foreach>
-            </if>
-            <if test="params.q != null and params.q != ''">
-                AND ( locate(#{params.q}, app.name) OR locate(#{params.q}, app.description) )
-            </if>
-            <if test="params.workspaceId != null and params.workspaceId != ''">
-                AND app.workspace_id = #{params.workspaceId}
-            </if>
-        </where>
-        <if test="params.orderBy == null or params.orderBy == ''">
-            ORDER BY app.id
-        </if>
-    </select>
-
-</mapper>
\ No newline at end of file
diff --git a/src/main/resources/db/migration/R__AZ_sys_i18n.sql b/src/main/resources/db/migration/R__AZ_sys_i18n.sql
index bd4c075..4bb6672 100644
--- a/src/main/resources/db/migration/R__AZ_sys_i18n.sql
+++ b/src/main/resources/db/migration/R__AZ_sys_i18n.sql
@@ -155,5 +155,7 @@ INSERT INTO `sys_i18n`(`id`, `name`, `code`, `value`, `lang`, `remark`, `update_
 INSERT INTO `sys_i18n`(`id`, `name`, `code`, `value`, `lang`, `remark`, `update_user_id`, `update_timestamp`) VALUES (247, '203004', 'GIT_BINARY_CONFLICT_ERROR', '发现二进制文件冲突；手动解决二进制文件中的冲突', 'zh', '', 'admin', 1724030366000);
 INSERT INTO `sys_i18n`(`id`, `name`, `code`, `value`, `lang`, `remark`, `update_user_id`, `update_timestamp`) VALUES (248, '203005', 'GIT_MERGE_NOT_SUPPORTED', 'Cannot merge in the {0} state', 'en', '', 'admin', 1724030366000);
 INSERT INTO `sys_i18n`(`id`, `name`, `code`, `value`, `lang`, `remark`, `update_user_id`, `update_timestamp`) VALUES (249, '203005', 'GIT_MERGE_NOT_SUPPORTED', '无法在{0}状态下合并', 'zh', '', 'admin', 1724030366000);
+INSERT INTO `sys_i18n`(`id`, `name`, `code`, `value`, `lang`, `remark`, `update_user_id`, `update_timestamp`) VALUES (250, '203006', 'GIT_MERGE_TARGET_BRANCH_NOT_EXIST', 'The target branch {0} does not exist.', 'en', '', 'admin', 1724030366000);
+INSERT INTO `sys_i18n`(`id`, `name`, `code`, `value`, `lang`, `remark`, `update_user_id`, `update_timestamp`) VALUES (251, '203006', 'GIT_MERGE_TARGET_BRANCH_NOT_EXIST', '目标分支 {0} 不存在', 'zh', '', 'admin', 1724030366000);
 
 SET FOREIGN_KEY_CHECKS = 1;