diff --git a/backend/src/Health.WebApi/Endpoints/ai_chat_endpoints.cs b/backend/src/Health.WebApi/Endpoints/ai_chat_endpoints.cs
index ae42229..fda129d 100644
--- a/backend/src/Health.WebApi/Endpoints/ai_chat_endpoints.cs
+++ b/backend/src/Health.WebApi/Endpoints/ai_chat_endpoints.cs
@@ -263,7 +263,7 @@ public static class AiChatEndpoints
 
                 // 压缩图片后转 base64（VLM API 有请求体大小限制）
                 var compressedPath = Path.Combine(uploadsDir, $"compressed_{safeName}");
-                CompressImage(filePath, compressedPath, maxWidth: 960, quality: 72L);
+                CompressImage(filePath, compressedPath, maxWidth: 2048, quality: 92L);
                 var compressedBytes = await File.ReadAllBytesAsync(compressedPath, ct);
                 var base64 = Convert.ToBase64String(compressedBytes);
                 imageUrls.Add($"data:image/jpeg;base64,{base64}");
diff --git a/backend/src/Health.WebApi/uploads/49cd030b-0713-46eb-ae82-db2e60de7a19_ʳ������һ����������.png b/backend/src/Health.WebApi/uploads/49cd030b-0713-46eb-ae82-db2e60de7a19_ʳ������һ����������.png
new file mode 100644
index 0000000..37b003f
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diff --git a/backend/src/Health.WebApi/uploads/compressed_49cd030b-0713-46eb-ae82-db2e60de7a19_ʳ������һ����������.png b/backend/src/Health.WebApi/uploads/compressed_49cd030b-0713-46eb-ae82-db2e60de7a19_ʳ������һ����������.png
new file mode 100644
index 0000000..d83aa7b
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