diff --git a/swift/template/base.py b/swift/template/base.py
index e4ec978021..63aed1ec83 100644
--- a/swift/template/base.py
+++ b/swift/template/base.py
@@ -777,8 +777,8 @@ def prepare_generate_kwargs(self, generate_kwargs: Dict[str, Any], *, model=None
 
     @staticmethod
     def _save_pil_image(image: Image.Image) -> str:
-        img_bytes = image.tobytes()
-        img_hash = hashlib.sha256(img_bytes).hexdigest()
+        img_meta = f'{image.mode}:{image.width}:{image.height}:'.encode()
+        img_hash = hashlib.sha256(img_meta + image.tobytes()).hexdigest()
         tmp_dir = os.path.join(get_cache_dir(), 'tmp', 'images')
         logger.info_once(f'create tmp_dir: {tmp_dir}')
         os.makedirs(tmp_dir, exist_ok=True)
diff --git a/tests/llm/test_template.py b/tests/llm/test_template.py
index 062cb439fd..1da378652a 100644
--- a/tests/llm/test_template.py
+++ b/tests/llm/test_template.py
@@ -1,10 +1,14 @@
 import os
+import tempfile
 import torch
 import unittest
+from unittest.mock import patch
 
+from PIL import Image
 from swift.infer_engine import RequestConfig, TransformersEngine
 from swift.model import get_processor
 from swift.template import get_template
+from swift.template.base import Template
 from swift.utils import get_logger, seed_everything
 
 # os.environ['CUDA_VISIBLE_DEVICES'] = '0'
@@ -103,6 +107,28 @@ def test_tool_message_join(self):
                 f'{observation}tool2\n{observation}tool3\n')
             assert res == ground_truth
 
+    def test_save_pil_image_uses_dimensions_in_cache_key(self):
+        width_a, height_a = 120, 80
+        width_b, height_b = 80, 120
+        self.assertEqual(width_a * height_a, width_b * height_b)
+
+        pixels = bytearray()
+        for i in range(width_a * height_a):
+            row = i // width_a
+            pixels.extend((255, 60, 60) if row % 10 < 5 else (60, 60, 255))
+        img_bytes = bytes(pixels)
+
+        image_a = Image.frombytes('RGB', (width_a, height_a), img_bytes)
+        image_b = Image.frombytes('RGB', (width_b, height_b), img_bytes)
+
+        with tempfile.TemporaryDirectory() as cache_dir, patch('swift.template.base.get_cache_dir', return_value=cache_dir):
+            path_a = Template._save_pil_image(image_a)
+            path_b = Template._save_pil_image(image_b)
+
+            self.assertNotEqual(path_a, path_b)
+            self.assertEqual(Image.open(path_a).size, (width_a, height_a))
+            self.assertEqual(Image.open(path_b).size, (width_b, height_b))
+
 
 if __name__ == '__main__':
     unittest.main()