diff --git a/src/backend/app/controllers/image_controller.py b/src/backend/app/controllers/image_controller.py
index f469396..0d6bd03 100644
--- a/src/backend/app/controllers/image_controller.py
+++ b/src/backend/app/controllers/image_controller.py
@@ -42,7 +42,7 @@ def upload_original_images(current_user_id):
 
     return jsonify({
         'message': '图片上传成功',
-        'images': [image_to_base64(img) for img in result],
+        'images': [ImageService.image_to_base64(img) for img in result],
         'flow_id': task.flow_id
     }), 201
 
@@ -100,7 +100,7 @@ def get_task_images(task_id, current_user_id):
 
     return jsonify({
         'task_id': task_id,
-        'images': [image_to_base64(img) for img in images],
+        'images': [ImageService.image_to_base64(img) for img in images],
         'total': len(images)
     }), 200
 
@@ -125,7 +125,7 @@ def get_perturbation_images(task_id, current_user_id):
     return jsonify({
         'task_id': task_id,
         'task_type': 'perturbation',
-        'images': [image_to_base64(img) for img in images],
+        'images': [ImageService.image_to_base64(img) for img in images],
         'total': len(images)
     }), 200
 
@@ -150,7 +150,7 @@ def get_heatmap_images(task_id, current_user_id):
     return jsonify({
         'task_id': task_id,
         'task_type': 'heatmap',
-        'images': [image_to_base64(img) for img in images],
+        'images': [ImageService.image_to_base64(img) for img in images],
         'total': len(images)
     }), 200
 
@@ -192,8 +192,8 @@ def get_finetune_images(task_id, current_user_id):
                 image_types_id=perturbed_gen_type.image_types_id
             ).all()
 
-        result['original_generate'] = [image_to_base64(img) for img in original_images]
-        result['perturbed_generate'] = [image_to_base64(img) for img in perturbed_images]
+        result['original_generate'] = [ImageService.image_to_base64(img) for img in original_images]
+        result['perturbed_generate'] = [ImageService.image_to_base64(img) for img in perturbed_images]
         result['total'] = len(original_images) + len(perturbed_images)
     else:
         uploaded_gen_type = ImageType.query.filter_by(image_code='uploaded_generate').first()
@@ -205,7 +205,7 @@ def get_finetune_images(task_id, current_user_id):
                 image_types_id=uploaded_gen_type.image_types_id
             ).all()
 
-        result['uploaded_generate'] = [image_to_base64(img) for img in uploaded_images]
+        result['uploaded_generate'] = [ImageService.image_to_base64(img) for img in uploaded_images]
         result['total'] = len(uploaded_images)
 
     return jsonify(result), 200
@@ -231,7 +231,7 @@ def get_evaluate_images(task_id, current_user_id):
     return jsonify({
         'task_id': task_id,
         'task_type': 'evaluate',
-        'images': [image_to_base64(img) for img in images],
+        'images': [ImageService.image_to_base64(img) for img in images],
         'total': len(images)
     }), 200
 
diff --git a/src/backend/app/services/image_service.py b/src/backend/app/services/image_service.py
index ce88ab4..1bdddd0 100644
--- a/src/backend/app/services/image_service.py
+++ b/src/backend/app/services/image_service.py
@@ -3,6 +3,7 @@
 处理图像上传、保存等功能
 """
 
+import base64
 import io
 import os
 import uuid
@@ -18,12 +19,12 @@ from app.utils.file_utils import allowed_file
 
 class ImageService:
     @staticmethod
-    def save_to_uploads(file, batch_id, user_id):
+    def save_to_uploads(file, task_id, user_id):
         """
         上传图片到uploads临时目录，返回临时文件路径和原始文件名。
         """
         project_root = os.path.dirname(current_app.root_path)
-        upload_dir = os.path.join(project_root, current_app.config['UPLOAD_FOLDER'], str(user_id), str(batch_id))
+        upload_dir = os.path.join(project_root, current_app.config['UPLOAD_FOLDER'], str(user_id), str(task_id))
         os.makedirs(upload_dir, exist_ok=True)
         orig_ext = os.path.splitext(file.filename)[1].lower()
         temp_name = f"{uuid.uuid4().hex}{orig_ext}"
@@ -32,7 +33,7 @@ class ImageService:
         return temp_path, file.filename
 
     @staticmethod
-    def preprocess_image(temp_path, original_filename, batch_id, user_id, image_type_id, resolution=512, target_format='png'):
+    def preprocess_image(temp_path, original_filename, task_id, user_id, image_types_id, resolution=512, target_format='png'):
         """
         对图片进行中心裁剪、缩放、格式转换、重命名，保存到static/originals，返回数据库对象。
         原图命名格式: 0000.png, 0001.png, ..., 9999.png
@@ -53,23 +54,23 @@ class ImageService:
             img = img.resize((resolution, resolution), resample=PILImage.Resampling.LANCZOS)
 
             project_root = os.path.dirname(current_app.root_path)
-            static_dir = os.path.join(project_root, current_app.config['ORIGINAL_IMAGES_FOLDER'], str(user_id), str(batch_id))
+            static_dir = os.path.join(project_root, current_app.config['ORIGINAL_IMAGES_FOLDER'], str(user_id), str(task_id))
             os.makedirs(static_dir, exist_ok=True)
             
             from app.database import ImageType
-            original_type = ImageType.query.filter_by(type_code='original').first()
-            target_image_type_id = original_type.id if original_type else image_type_id
+            original_type = ImageType.query.filter_by(image_code='original').first()
+            target_image_types_id = original_type.image_types_id if original_type else image_types_id
             
             # 首次查询最大序号
             max_seq_result = db.session.execute(
                 db.text("""
                     SELECT COALESCE(MAX(CAST(SUBSTRING_INDEX(stored_filename, '.', 1) AS UNSIGNED)), -1) as max_seq
                     FROM images 
-                    WHERE batch_id = :batch_id 
-                    AND image_type_id = :image_type_id
+                    WHERE task_id = :task_id 
+                    AND image_types_id = :image_types_id
                     AND stored_filename REGEXP '^[0-9]{4}\\.'
                 """),
-                {'batch_id': batch_id, 'image_type_id': target_image_type_id}
+                {'task_id': task_id, 'image_types_id': target_image_types_id}
             ).fetchone()
             
             # 强制类型转换，确保安全
@@ -89,7 +90,7 @@ class ImageService:
                 try:
                     # 检查数据库中是否已存在此文件名
                     existing = Image.query.filter_by(
-                        batch_id=batch_id,
+                        task_id=task_id,
                         stored_filename=new_name
                     ).first()
                     
@@ -105,13 +106,11 @@ class ImageService:
 
                     # 创建数据库记录
                     image = Image(
-                        user_id=user_id,
-                        batch_id=batch_id,
-                        original_filename=original_filename,
+                        task_id=task_id,
+                        image_types_id=image_types_id,
                         stored_filename=new_name,
                         file_path=final_path,
                         file_size=os.path.getsize(final_path),
-                        image_type_id=image_type_id,
                         width=img.width,
                         height=img.height
                     )
@@ -133,7 +132,7 @@ class ImageService:
                         if final_path and os.path.exists(final_path):
                             try:
                                 os.remove(final_path)
-                            except:
+                            except Exception:
                                 pass
                         # 继续循环尝试下一个序号
                         time.sleep(0.005)
@@ -151,26 +150,24 @@ class ImageService:
             if final_path and os.path.exists(final_path):
                 try:
                     os.remove(final_path)
-                except:
+                except Exception:
                     pass
             return {'success': False, 'error': f'图片预处理失败: {str(e)}'}
-    
-    """图像处理服务"""
-    
+
     @staticmethod
-    def save_image(file, batch_id, user_id, image_type_id, resolution=512, target_format='png'):
+    def save_image(file, task_id, user_id, image_types_id, resolution=512, target_format='png'):
         """保存单张图片，自动上传到uploads并预处理"""
         try:
             if not file or not allowed_file(file.filename):
                 return {'success': False, 'error': '不支持的文件格式'}
-            temp_path, orig_name = ImageService.save_to_uploads(file, batch_id, user_id)
-            return ImageService.preprocess_image(temp_path, orig_name, batch_id, user_id, image_type_id, resolution, target_format)
+            temp_path, orig_name = ImageService.save_to_uploads(file, task_id, user_id)
+            return ImageService.preprocess_image(temp_path, orig_name, task_id, user_id, image_types_id, resolution, target_format)
         except Exception as e:
             db.session.rollback()
             return {'success': False, 'error': f'保存图片失败: {str(e)}'}
     
     @staticmethod
-    def extract_and_save_zip(zip_file, batch_id, user_id, image_type_id):
+    def extract_and_save_zip(zip_file, task_id, user_id, image_types_id):
         """解压并保存压缩包中的图片"""
         results = []
         temp_dir = None
@@ -209,7 +206,7 @@ class ImageService:
                                 shutil.copy2(self.path, destination)
                         
                         virtual_file = FileWrapper(file_path, filename)
-                        result = ImageService.save_image(virtual_file, batch_id, user_id, image_type_id)
+                        result = ImageService.save_image(virtual_file, task_id, user_id, image_types_id)
                         results.append(result)
             
             return results
@@ -223,7 +220,7 @@ class ImageService:
                 import shutil
                 try:
                     shutil.rmtree(temp_dir)
-                except:
+                except Exception:
                     pass
     
     @staticmethod
@@ -233,15 +230,19 @@ class ImageService:
             return None
         
         # 这里返回相对路径，前端可以拼接完整URL
-        return f"/api/image/file/{image.id}"
+        return f"/api/image/file/{image.images_id}"
     
     @staticmethod
     def delete_image(image_id, user_id):
-        """删除图片"""
+        """删除图片（通过关联的task验证权限）"""
         try:
-            image = Image.query.filter_by(id=image_id, user_id=user_id).first()
+            image = Image.query.filter_by(images_id=image_id).first()
             if not image:
-                return {'success': False, 'error': '图片不存在或无权限'}
+                return {'success': False, 'error': '图片不存在'}
+            
+            # 通过关联的task验证用户权限
+            if not image.task or image.task.user_id != user_id:
+                return {'success': False, 'error': '无权限删除该图片'}
             
             # 删除文件
             if os.path.exists(image.file_path):