diff --git a/src/main/java/com/tem/bocai/util/LotteryWebMagicCrawler.java b/src/main/java/com/tem/bocai/util/LotteryWebMagicCrawler.java
index d9c38e0..8307f0d 100644
--- a/src/main/java/com/tem/bocai/util/LotteryWebMagicCrawler.java
+++ b/src/main/java/com/tem/bocai/util/LotteryWebMagicCrawler.java
@@ -255,8 +255,7 @@ public class LotteryWebMagicCrawler implements PageProcessor {
             String directoryPath = path+"/current_data"; // 项目根目录下的 output/json 文件夹
 
             // 使用年月日作为文件名（格式：result_yyyyMMdd.json）
-            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
-            String dateStr = dateFormat.format(new Date());
+            String dateStr = DateUtils.getTodayDate();
             String fileName = "result_" + dateStr + ".json";
             String filePath = directoryPath + "/" + fileName;
 
@@ -269,18 +268,47 @@ public class LotteryWebMagicCrawler implements PageProcessor {
             // 创建文件对象
             File outputFile = new File(filePath);
 
-            // 如果文件已存在，删除旧文件（实现替换功能）
+            // 如果文件已存在，读取现有数据并对比
+            List<Map<String, Object>> existingData = new ArrayList<>();
+            Set<String> existingIds = new HashSet<>();
             if (outputFile.exists()) {
-                boolean deleted = outputFile.delete();
-                if (!deleted) {
-                    throw new IOException("无法删除已存在的文件: " + filePath);
+                try {
+                    existingData = objectMapper.readValue(outputFile,
+                            objectMapper.getTypeFactory().constructCollectionType(List.class, Map.class));
+                    for (Map<String, Object> item : existingData) {
+                        if (item.containsKey("id")) {
+                            existingIds.add(item.get("id").toString());
+                        }
+                    }
+                    log.info("已读取现有数据，共 " + existingData.size() + " 条记录");
+                } catch (IOException e) {
+                    log.warn("读取现有文件失败，将覆盖写入: " + e.getMessage());
+                    existingIds.clear();
                 }
-                System.out.println("已删除旧文件，准备创建新文件: " + fileName);
             }
 
-            // 将 List 写入 JSON 文件
-            objectMapper.writeValue(outputFile, resultList);
-            log.info("数据已成功写入文件: " + outputFile.getAbsolutePath());
+            // 筛选出新增的数据（id不在existingIds中的记录）
+            List<Map<String, Object>> newData = new ArrayList<>();
+            for (Map<String, Object> item : resultList) {
+                if (item.containsKey("id")) {
+                    String id = item.get("id").toString();
+                    if (!existingIds.contains(id)) {
+                        newData.add(item);
+                    }
+                }
+            }
+
+            // 合并现有数据和新数据
+            List<Map<String, Object>> finalData = new ArrayList<>();
+            if (!existingData.isEmpty()) {
+                finalData.addAll(existingData);
+            }
+            finalData.addAll(newData);
+
+            // 将合并后的数据写入 JSON 文件
+            objectMapper.writeValue(outputFile, finalData);
+            log.info("数据已成功写入文件: " + outputFile.getAbsolutePath() +
+                    " (现有: " + existingData.size() + " 条, 新增: " + newData.size() + " 条, 总计: " + finalData.size() + " 条)");
         } catch (IOException e) {
             e.printStackTrace();
             log.error("写入 JSON 文件失败: " + e.getMessage(), e);