diff --git a/src/main/java/org/example/ImageDotMarker.java b/src/main/java/org/example/ImageDotMarker.java
index 193e995..e864ff4 100644
--- a/src/main/java/org/example/ImageDotMarker.java
+++ b/src/main/java/org/example/ImageDotMarker.java
@@ -453,38 +453,57 @@ public class ImageDotMarker extends JFrame {
         }
 
         JFileChooser fileChooser = new JFileChooser();
-        fileChooser.setSelectedFile(new File("mark_points.txt"));
-        fileChooser.setFileFilter(new FileNameExtensionFilter("文本文件 (*.txt)", "txt"));
+        
+        // 设置默认文件名，使用当前图片文件名作为基础
+        String defaultFilename = "mark_points.csv";
+        if (currentImagePath != null) {
+            File imageFile = new File(currentImagePath);
+            String imageName = imageFile.getName();
+            // 移除图片扩展名
+            int lastDotIndex = imageName.lastIndexOf('.');
+            if (lastDotIndex > 0) {
+                imageName = imageName.substring(0, lastDotIndex);
+            }
+            defaultFilename = imageName + "_mark_points.csv";
+        }
+        
+        fileChooser.setSelectedFile(new File(defaultFilename));
+        fileChooser.setFileFilter(new FileNameExtensionFilter("CSV文件 (*.csv)", "csv"));
 
         int result = fileChooser.showSaveDialog(this);
         if (result == JFileChooser.APPROVE_OPTION) {
             try {
                 File file = fileChooser.getSelectedFile();
-                if (!file.getName().toLowerCase().endsWith(".txt")) {
-                    file = new File(file.getAbsolutePath() + ".txt");
+                if (!file.getName().toLowerCase().endsWith(".csv")) {
+                    file = new File(file.getAbsolutePath() + ".csv");
                 }
 
                 StringBuilder sb = new StringBuilder();
-                // 添加头部信息
-                sb.append("# 图片标记点坐标导出\n");
-                if (currentImagePath != null) {
-                    sb.append(String.format("# 来源图片: %s\n", new File(currentImagePath).getName()));
-                }
-                sb.append(String.format("# 导出时间: %s\n", new java.util.Date()));
-                sb.append("# ======================================\n\n");
-                
-                // 添加标记点数据
+                // CSV列标题
                 sb.append("序号,名称,X坐标,Y坐标\n");
+                
+                // 添加标记点数据，确保CSV格式正确处理包含逗号或引号的名称
                 for (int i = 0; i < points.size(); i++) {
                     MarkPoint p = points.get(i);
-                    sb.append(String.format("%d,%s,%d,%d\n", i + 1, p.name, p.x, p.y));
+                    String quotedName = p.name;
+                    // CSV格式要求：如果字段包含逗号、双引号或换行符，需要用双引号包围，且内部的双引号用两个双引号表示
+                    if (quotedName.contains(",") || quotedName.contains("\"") || quotedName.contains("\n")) {
+                        quotedName = "\"" + quotedName.replace("\"", "\"\"") + "\"";
+                    }
+                    sb.append(String.format("%d,%s,%d,%d\n", i + 1, quotedName, p.x, p.y));
                 }
 
-                // 写入文件
-                java.nio.file.Files.write(file.toPath(), sb.toString().getBytes("UTF-8"));
+                // 写入文件，使用UTF-8编码并添加BOM以支持Excel正确识别中文
+                try (java.io.FileOutputStream fos = new java.io.FileOutputStream(file)) {
+                    // 写入UTF-8 BOM
+                    byte[] bom = {(byte)0xEF, (byte)0xBB, (byte)0xBF}; // UTF-8 BOM
+                    fos.write(bom);
+                    // 写入CSV内容
+                    fos.write(sb.toString().getBytes("UTF-8"));
+                }
                 
                 JOptionPane.showMessageDialog(this, "标记点坐标导出成功！\n保存位置: " + file.getAbsolutePath());
-                updateStatusBar("已导出标记点坐标到文件");
+                updateStatusBar("已导出标记点坐标到CSV文件");
             } catch (IOException ex) {
                 JOptionPane.showMessageDialog(this, "导出失败: " + ex.getMessage());
             }