diff --git a/src/forge/Main/CoderDepot.jsx b/src/forge/Main/CoderDepot.jsx
index 830681199..6ae5fa02f 100644
--- a/src/forge/Main/CoderDepot.jsx
+++ b/src/forge/Main/CoderDepot.jsx
@@ -102,7 +102,6 @@ function CoderDepot(props){
     }
   },[treeValue])
 
-
   useEffect(()=>{
     if (projectsId && owner && defaultBranch){
       let b = turnbar(branchName) ;
@@ -334,6 +333,15 @@ function CoderDepot(props){
     }
   }
 
+  // 如果项目是fork的项目，pr自动指向源仓库，否则指向本仓库默认分支
+  function compare() {
+    if (projectDetail && projectDetail.fork_info) {
+      urlLink(`/${projectDetail.fork_info.fork_project_user_login}/${projectDetail.fork_info.fork_project_identifier}/compare/${turnbar(branchName || defaultBranch)}...${owner + ':' + turnbar(branchName || defaultBranch)}`)
+    } else {
+      urlLink(`/${owner}/${projectsId}/compare/${turnbar(defaultBranch)}...${turnbar(branchName || defaultBranch)}`);
+    }
+  }
+
   let n = fileInfo && fileInfo.name;
   const mdFlag = n && n.substring(n.length-3,n.length) === ".md";
 
@@ -436,10 +444,10 @@ function CoderDepot(props){
                     </AlignCenter>
                     <AlignCenter className="depotBtn">
                       <div className="addOptionBtn">
-                        {
-                          baseOperate &&
-                          <CheckProfile {...props} sureFunc={()=>urlLink(`/${owner}/${projectsId}/compare/${turnbar(branchName || defaultBranch)}...${turnbar(branchName || defaultBranch)}`)} >+ 合并请求</CheckProfile>
-                        }
+                          {
+                            baseOperate &&
+                            <CheckProfile {...props} sureFunc={compare}>+ 合并请求</CheckProfile>
+                          }
                         {
                           issuesFlag &&
                           <a onClick={createIssue}>+ 疑修</a>
diff --git a/src/forge/Main/tree/Index.jsx b/src/forge/Main/tree/Index.jsx
index f7aa7bd8b..3f4bc0c06 100644
--- a/src/forge/Main/tree/Index.jsx
+++ b/src/forge/Main/tree/Index.jsx
@@ -85,7 +85,12 @@ function Index(props) {
                             <div className="treeabout">
                               {
                                 (isManager || isDeveloper) && (projectDetail && projectDetail.type!==2) &&
-                                <Link to={`/${owner}/${projectsId}/compare/${turnbar(defaultBranch)}...${turnbar(i.name)}`} className="btn-83">+ 合并请求</Link>
+                                <Link to={
+                                  // 如果项目是fork的项目，pr自动指向源仓库，否则指向本仓库默认分支
+                                  projectDetail && projectDetail.fork_info?
+                                  `/${projectDetail.fork_info.fork_project_user_login}/${projectDetail.fork_info.fork_project_identifier}/compare/${turnbar(i.name || defaultBranch)}...${owner + ':' + turnbar(i.name)}`
+                                  :`/${owner}/${projectsId}/compare/${turnbar(defaultBranch)}...${turnbar(i.name)}`
+                                } className="btn-83">+ 合并请求</Link>
                               }
                               <Dropdown overlay={menu(i.zip_url,i.tar_url)} trigger={['click']} placement="bottomRight">
                                 <a className="btn-83 ml15">下载<i className="iconfont icon-sanjiaoxing-down font-14"></i></a>
diff --git a/src/forge/Merge/CreateMerge.js b/src/forge/Merge/CreateMerge.js
index 4ed3570d4..b81219faa 100644
--- a/src/forge/Merge/CreateMerge.js
+++ b/src/forge/Merge/CreateMerge.js
@@ -223,12 +223,22 @@ class CreateMerge extends Component {
           return false;
         }
         if(type === "merge" && mfilter){
-          this.setState({
-            showMessage: mergebranch,
-            defaultMessage: `目标分支不存在`,
-            isCompareSpin: false
-          });
-          return false;
+          const {projectDetail,location,history}=this.props;
+          const { pullOwner, pullBranch, mergeOwner, mergeBranch, projectId } =
+          getBranchParams(location.pathname);
+          // 如果进来的第一次，查到目标分支不存在，自动切换到目标仓库默认分支
+          if (pullOwner !== mergeOwner && pullBranch=== mergeBranch) {
+            let _url = `/${mergeOwner}/${projectId}/compare/${(projectDetail.default_branch)}...${pullOwner}:${(pullBranch)}`;
+            history.push(_url);
+            return false;
+          }else{
+            this.setState({
+              showMessage: mergebranch,
+              defaultMessage: `目标分支不存在`,
+              isCompareSpin: false
+            });
+            return false;
+          }
         }
         return true;
       }
diff --git a/src/forge/Merge/merge.js b/src/forge/Merge/merge.js
index 172bfdbc4..0f6aeea4d 100644
--- a/src/forge/Merge/merge.js
+++ b/src/forge/Merge/merge.js
@@ -212,10 +212,14 @@ class merge extends Component {
     this.getIssueList();
   };
   checkOperation() {
-    const { defaultBranch } = this.props;
+    const { defaultBranch,projectDetail } = this.props;
     const { projectsId,owner } = this.props.match.params;
     let branch = turnbar(defaultBranch) || "master";
-    this.props.history.push(`/${owner}/${projectsId}/compare/${branch}...${branch}`);
+    if (projectDetail && projectDetail.fork_info) {
+      this.props.history.push(`/${projectDetail.fork_info.fork_project_user_login}/${projectDetail.fork_info.fork_project_identifier}/compare/${branch}...${owner + ':' + branch}`)
+    } else {
+      this.props.history.push(`/${owner}/${projectsId}/compare/${branch}...${branch}`);
+    }
   }
   render() {
     const { projectsId , owner } = this.props.match.params;