diff --git a/pdf_convertor.py b/pdf_convertor.py
index a700d44..b0b77bf 100755
--- a/pdf_convertor.py
+++ b/pdf_convertor.py
@@ -153,6 +153,14 @@ def refine_content(md: str, images: dict[str, bytes], pdf: bytes) -> str:
 
     # 添加 Markdown
     human_message_parts = []
+
+    human_message_parts.append(
+        {
+            "type": "text",
+            "text": "I will provide you with: \n1. Original Markdown text (with image references)\n2. Individual images with their exact filenames\n3. Original PDF for reference\n---\nOriginal Markdown text:\n",
+        }
+    )
+
     human_message_parts.append(
         {
             "type": "text",
@@ -161,11 +169,17 @@ def refine_content(md: str, images: dict[str, bytes], pdf: bytes) -> str:
     )
 
     # 添加图片
+    human_message_parts.append(
+        {
+            "type": "text",
+            "text": "\n\n---\n\nIndividual images (use ONLY these to describe the corresponding Markdown image references):\n\n",
+        }
+    )
     for image_name in images.keys():
         human_message_parts.append(
             {
                 "type": "text",
-                "text": f"This is image: '{image_name}':\n",
+                "text": f"=== START OF IMAGE: '{image_name}' ===\n",
             }
         )
         human_message_parts.append(
@@ -175,31 +189,29 @@ def refine_content(md: str, images: dict[str, bytes], pdf: bytes) -> str:
                 "mime_type": "image/png",
             }
         )
+        human_message_parts.append(
+            {
+                "type": "text",
+                "text": f"=== END OF IMAGE: '{image_name}' ===\n\n",
+            }
+        )
 
     # 添加 PDF
-    if provider == "gemini":
-        human_message_parts.extend(
-            [
-                {
-                    "type": "text",
-                    "text": "This is original PDF file:\n",
-                },
-                {
-                    "type": "media",
-                    "mime_type": "application/pdf",
-                    "data": base64.b64encode(pdf).decode("utf-8"),
-                },
-            ]
-        )
-    if provider == "openai":
+    human_message_parts.append(
+        {
+            "type": "text",
+            "text": "\n---\n\nOriginal PDF (for overall layout and context reference only):\n\n",
+        }
+    )
+
+    if provider == "gemini" or provider == "openai":
         human_message_parts.extend(
             [
                 {
                     "type": "file",
-                    "file": {
-                        "filename": "origin.pdf",
-                        "file_data": f"data:application/pdf;base64,{base64.b64encode(pdf).decode('utf-8')}",
-                    },
+                    "base64": base64.b64encode(pdf).decode("utf-8"),
+                    "mime_type": "application/pdf",
+                    "filename": "origin.pdf",
                 },
             ]
         )