diff --git a/SELECT b/SELECT
new file mode 100644
index 0000000..e69de29
diff --git a/src/main/java/com/superbiz/agent/service/KnowledgeIndexService.java b/src/main/java/com/superbiz/agent/service/KnowledgeIndexService.java
index 1d144ca..a97270b 100644
--- a/src/main/java/com/superbiz/agent/service/KnowledgeIndexService.java
+++ b/src/main/java/com/superbiz/agent/service/KnowledgeIndexService.java
@@ -29,6 +29,9 @@ import java.util.stream.Stream;
 @Service
 public class KnowledgeIndexService {
 
+    @Value("${knowledge.base-path:knowledge_base}")
+    private String knowledgeBasePath;
+
     @Autowired
     private ApiDocumentRepository apiDocumentRepository;
 
@@ -195,13 +198,15 @@ public class KnowledgeIndexService {
     /**
      * 读取文档内容
      *
-     * @param filePath 文件路径
+     * @param filePath 文件相对路径（如 api/payment-errors.md）
      * @param maxChars 最大字符数
      * @return 文档内容（前 maxChars 字符），失败返回 null
      */
     public String readDocument(String filePath, int maxChars) {
         try {
-            String content = Files.readString(Paths.get(filePath));
+            // 拼接完整路径：knowledge_base + 相对路径
+            Path fullPath = Paths.get(knowledgeBasePath, filePath);
+            String content = Files.readString(fullPath);
 
             if (content.length() > maxChars) {
                 return content.substring(0, maxChars) + "...";
@@ -210,7 +215,7 @@ public class KnowledgeIndexService {
             return content;
 
         } catch (IOException e) {
-            log.error("读取文档失败: {}", filePath, e);
+            log.error("读取文档失败: {}/{}", knowledgeBasePath, filePath, e);
             return null;
         }
     }
diff --git a/src/test/java/com/superbiz/agent/repository/ApiDocumentRepositoryTest.java b/src/test/java/com/superbiz/agent/repository/ApiDocumentRepositoryTest.java
index 6fe2034..5ef1a3b 100644
--- a/src/test/java/com/superbiz/agent/repository/ApiDocumentRepositoryTest.java
+++ b/src/test/java/com/superbiz/agent/repository/ApiDocumentRepositoryTest.java
@@ -40,7 +40,7 @@ class ApiDocumentRepositoryTest {
             .filePath("/uploads/api-spec.md")
             .fileHash("abc123hash")
             .fileSize(1024L)
-            .faultCategory(FaultCategory.EXTERNAL_API)
+            .faultCategory(FaultCategory.API)
             .faultSource("广东")
             .apiName("查询接口")
             .status("PENDING")
@@ -167,7 +167,7 @@ class ApiDocumentRepositoryTest {
             .docId(UUID.randomUUID().toString())
             .fileName("guangdong-api.md")
             .faultSource("广东")
-            .faultCategory(FaultCategory.EXTERNAL_API)
+            .faultCategory(FaultCategory.API)
             .build();
 
         repository.save(doc);
diff --git a/src/test/java/com/superbiz/agent/repository/DiagnosisRecordRepositoryTest.java b/src/test/java/com/superbiz/agent/repository/DiagnosisRecordRepositoryTest.java
index 6f825a5..da07f12 100644
--- a/src/test/java/com/superbiz/agent/repository/DiagnosisRecordRepositoryTest.java
+++ b/src/test/java/com/superbiz/agent/repository/DiagnosisRecordRepositoryTest.java
@@ -38,7 +38,7 @@ class DiagnosisRecordRepositoryTest {
             .sessionId("session-001")
             .businessId("order-12345")
             .traceId("trace-abc123")
-            .faultCategory(FaultCategory.EXTERNAL_API)
+            .faultCategory(FaultCategory.API)
             .faultSource("广东")
             .faultTarget("http://api.example.com/query")
             .errorCode("40003")