diff --git a/src/main/java/com/guo/learningprogresstracker/service/impl/StandardMindMapServiceImpl.java b/src/main/java/com/guo/learningprogresstracker/service/impl/StandardMindMapServiceImpl.java
index 5877af4..aac66f0 100644
--- a/src/main/java/com/guo/learningprogresstracker/service/impl/StandardMindMapServiceImpl.java
+++ b/src/main/java/com/guo/learningprogresstracker/service/impl/StandardMindMapServiceImpl.java
@@ -270,14 +270,21 @@ public class StandardMindMapServiceImpl implements StandardMindMapService {
             }
         }
 
-        // 4. 读取 extraNodes
+        // 4. 读取 extraNodes（兼容字符串数组和对象数组两种格式）
         List<CompareResult.FlatNode> extras = new ArrayList<>();
         JsonNode extrasArr = aiJson.path("extraNodes");
         if (extrasArr.isArray()) {
             for (JsonNode e : extrasArr) {
                 CompareResult.FlatNode fn = new CompareResult.FlatNode();
-                fn.setTitle(e.path("title").asText(""));
-                fn.setPath(e.path("path").asText(""));
+                if (e.isTextual()) {
+                    // 字符串格式 ["知识点D1", "知识点D2"]
+                    fn.setTitle(e.asText(""));
+                    fn.setPath("");
+                } else {
+                    // 对象格式 [{ title: "...", path: "..." }]
+                    fn.setTitle(e.path("title").asText(""));
+                    fn.setPath(e.path("path").asText(""));
+                }
                 extras.add(fn);
             }
         }