diff --git a/src/main/java/com/sftp/manager/controller/FileController.java b/src/main/java/com/sftp/manager/controller/FileController.java
index e15802c..e910e34 100644
--- a/src/main/java/com/sftp/manager/controller/FileController.java
+++ b/src/main/java/com/sftp/manager/controller/FileController.java
@@ -201,10 +201,10 @@ public class FileController {
                 // 本地到本地
                 Files.copy(new File(sourcePath).toPath(), new File(finalTargetPath).toPath());
             } else if ("local".equals(sourceSessionId)) {
-                // 本地到SFTP
+                // 本地到SFTP（上传到服务器）
                 localFileService.uploadToSftp(sourcePath, targetSessionId, finalTargetPath, sftpService);
             } else if ("local".equals(targetSessionId)) {
-                // SFTP到本地
+                // SFTP到本地（从服务器下载）
                 localFileService.downloadFromSftp(sourceSessionId, sourcePath, finalTargetPath, sftpService);
             } else {
                 // SFTP到SFTP
@@ -214,7 +214,20 @@ public class FileController {
 
             return ApiResponse.success("传输成功", null);
         } catch (Exception e) {
-            return ApiResponse.error("传输失败: " + e.getMessage());
+            String msg = e.getMessage() != null ? e.getMessage() : "未知错误";
+            String src = request.getSourceSessionId();
+            String tgt = request.getTargetSessionId();
+            String prefix;
+            if ("local".equals(src) && !"local".equals(tgt)) {
+                prefix = "上传到服务器失败";
+            } else if (!"local".equals(src) && "local".equals(tgt)) {
+                prefix = "下载到本地失败";
+            } else if (!"local".equals(src) && !"local".equals(tgt)) {
+                prefix = "服务器间传输失败";
+            } else {
+                prefix = "传输失败";
+            }
+            return ApiResponse.error(prefix + ": " + msg);
         }
     }
 
diff --git a/src/main/resources/static/index.html b/src/main/resources/static/index.html
index 80467c0..51bb5d8 100644
--- a/src/main/resources/static/index.html
+++ b/src/main/resources/static/index.html
@@ -24,7 +24,8 @@
             <div class="btn-group" role="group">
                 <button type="button" class="btn btn-sm btn-outline-primary" onclick="uploadFiles()">上传</button>
                 <button type="button" class="btn btn-sm btn-outline-primary" onclick="downloadFiles()">下载</button>
-                <button type="button" class="btn btn-sm btn-outline-primary" onclick="transferFiles()">传输到右侧</button>
+                <button type="button" class="btn btn-sm btn-outline-primary" onclick="transferToRight()">传输到右侧</button>
+                <button type="button" class="btn btn-sm btn-outline-primary" onclick="transferToLeft()">传输到左侧</button>
                 <button type="button" class="btn btn-sm btn-outline-danger" onclick="deleteFiles()">删除</button>
                 <button type="button" class="btn btn-sm btn-outline-secondary" onclick="showRenameDialog()">重命名</button>
                 <button type="button" class="btn btn-sm btn-outline-secondary" onclick="showMkdirDialog()">新建文件夹</button>
diff --git a/src/main/resources/static/js/app.js b/src/main/resources/static/js/app.js
index c0d1992..cea754b 100644
--- a/src/main/resources/static/js/app.js
+++ b/src/main/resources/static/js/app.js
@@ -354,7 +354,7 @@ function handleFileDrop(data, targetPanelId) {
     const targetPath = panelState[targetPanelId].currentPath;
 
     if (sourcePanelId === targetPanelId) {
-        updateStatus('同面板内移动功能开发中，请使用「传输到右侧」按钮');
+        updateStatus('同面板内移动功能开发中，请使用「传输到右侧」或「传输到左侧」按钮');
         return;
     }
 
@@ -1061,19 +1061,15 @@ function downloadFiles() {
     });
 }
 
-// 传输到对面面板
-function transferFiles() {
-    const sourcePanelId = getSourcePanelId();
-    const targetPanelId = sourcePanelId === 'left' ? 'right' : 'left';
-
+// 按方向执行跨面板传输（源面板 -> 目标面板）
+function doTransfer(sourcePanelId, targetPanelId) {
     const sourceSessionId = panelState[sourcePanelId].sessionId;
     const targetSessionId = panelState[targetPanelId].sessionId;
     const targetPath = panelState[targetPanelId].currentPath;
-
     const selectedFiles = panelState[sourcePanelId].selectedFiles;
 
     if (selectedFiles.length === 0) {
-        alert('请先选择要传输的文件');
+        alert('请在' + (sourcePanelId === 'left' ? '左侧' : '右侧') + '面板选择要传输的文件');
         return;
     }
 
@@ -1089,7 +1085,7 @@ function transferFiles() {
     showTransferCountProgress(0, total, '');
     updateTransferProgress(0, '传输中 (0/' + total + ')');
 
-    selectedFiles.forEach(function(sourcePath, index) {
+    selectedFiles.forEach(function(sourcePath) {
         $.ajax({
             url: API_BASE + 'api/files/transfer',
             method: 'POST',
@@ -1139,6 +1135,16 @@ function transferFiles() {
     updateStatus('正在传输 ' + total + ' 个文件...');
 }
 
+// 传输到右侧：左侧面板选中的文件 -> 右侧面板
+function transferToRight() {
+    doTransfer('left', 'right');
+}
+
+// 传输到左侧：右侧面板选中的文件 -> 左侧面板
+function transferToLeft() {
+    doTransfer('right', 'left');
+}
+
 // ========== 文件删除功能（模块06）==========
 
 // 工具栏删除：删除当前活动面板中选中的文件
diff --git a/src/main/resources/templates/index.html b/src/main/resources/templates/index.html
index 9f15f84..13206b9 100644
--- a/src/main/resources/templates/index.html
+++ b/src/main/resources/templates/index.html
@@ -24,7 +24,8 @@
             <div class="btn-group" role="group">
                 <button type="button" class="btn btn-sm btn-outline-primary" onclick="uploadFiles()">上传</button>
                 <button type="button" class="btn btn-sm btn-outline-primary" onclick="downloadFiles()">下载</button>
-                <button type="button" class="btn btn-sm btn-outline-primary" onclick="transferFiles()">传输到右侧</button>
+                <button type="button" class="btn btn-sm btn-outline-primary" onclick="transferToRight()">传输到右侧</button>
+                <button type="button" class="btn btn-sm btn-outline-primary" onclick="transferToLeft()">传输到左侧</button>
                 <button type="button" class="btn btn-sm btn-outline-danger" onclick="deleteFiles()">删除</button>
                 <button type="button" class="btn btn-sm btn-outline-secondary" onclick="showRenameDialog()">重命名</button>
                 <button type="button" class="btn btn-sm btn-outline-secondary" onclick="showMkdirDialog()">新建文件夹</button>