diff --git a/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/application/DatasetFileApplicationService.java b/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/application/DatasetFileApplicationService.java
index 4427c389..43b81720 100644
--- a/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/application/DatasetFileApplicationService.java
+++ b/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/application/DatasetFileApplicationService.java
@@ -1057,9 +1057,6 @@ private void setDatasetFileId(DatasetFile datasetFile, Dataset dataset) {
      */
     @Transactional
     public List<DatasetFile> addFilesToDataset(String datasetId, AddFilesRequest req) {
-        if (!req.isValidPrefix()) {
-            throw BusinessException.of(DataManagementErrorCode.DIRECTORY_NOT_FOUND);
-        }
         Dataset dataset = datasetRepository.getById(datasetId);
         BusinessAssert.notNull(dataset, SystemErrorCode.RESOURCE_NOT_FOUND);
         List<DatasetFile> addedFiles = new ArrayList<>();
@@ -1161,7 +1158,7 @@ private static DatasetFile getDatasetFileForAdd(AddFilesRequest req, AddFilesReq
                 .fileName(fileName)
                 .fileType(AnalyzerUtils.getExtension(fileName))
                 .fileSize(sourceFile.length())
-                .filePath(Paths.get(dataset.getPath(), req.getPrefix(), fileName).toString())
+                .filePath(Paths.get(dataset.getPath(), req.getEffectivePrefix(file), fileName).toString())
                 .uploadTime(currentTime)
                 .lastAccessTime(currentTime)
                 .metadata(objectMapper.writeValueAsString(file.getMetadata()))
diff --git a/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/interfaces/dto/AddFilesRequest.java b/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/interfaces/dto/AddFilesRequest.java
index 66fdde47..6416c192 100644
--- a/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/interfaces/dto/AddFilesRequest.java
+++ b/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/interfaces/dto/AddFilesRequest.java
@@ -10,14 +10,13 @@
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import org.apache.commons.collections4.CollectionUtils;
-import org.apache.commons.lang3.StringUtils;
 
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 /**
- * AddFilesRequest1
+ * AddFilesRequest
  *
  * @since 2026/2/9
  */
@@ -26,17 +25,34 @@
 @NoArgsConstructor
 @AllArgsConstructor
 public class AddFilesRequest {
+    private boolean softAdd;
+
+    @ValidPath
+    private String prefix = "";
+
+    @NotEmpty(message = "文件列表不能为空")
+    @Size(max = 1000, message = "文件数量不能超过1000个")
+    @Valid
+    private List<FileRequest> files;
+
     public AddFilesRequest(List<String> paths) {
         if (CollectionUtils.isEmpty(paths)) {
             return;
         }
         this.files = paths.stream().map(path -> {
-            AddFilesRequest.FileRequest file = new AddFilesRequest.FileRequest();
+            FileRequest file = new FileRequest();
             file.setFilePath(path);
-            return  file;
+            return file;
         }).toList();
     }
 
+    /**
+     * 获取文件的前缀，优先使用文件自身的 prefix，为空时回退到请求级别的 prefix
+     */
+    public String getEffectivePrefix(FileRequest file) {
+        return (file.getPrefix() != null && !file.getPrefix().isEmpty()) ? file.getPrefix() : prefix;
+    }
+
     @Getter
     @Setter
     public static class FileRequest {
@@ -44,20 +60,9 @@ public static class FileRequest {
         @Size(max = 1000, message = "文件路径长度不能超过1000个字符")
         private String filePath;
 
-        private Map<String, Object> metadata = new HashMap<>();
-    }
-
-    private boolean softAdd;
+        @ValidPath
+        private String prefix = "";
 
-    @ValidPath()
-    private String prefix = "";
-
-    @NotEmpty(message = "文件列表不能为空")
-    @Size(max = 1000, message = "文件数量不能超过1000个")
-    @Valid
-    private List<FileRequest> files;
-
-    public boolean isValidPrefix() {
-        return StringUtils.isEmpty(prefix) || (!prefix.startsWith("."));
+        private Map<String, Object> metadata = new HashMap<>();
     }
 }