diff --git a/ruoyi-common/ruoyi-common-oss/src/main/java/org/dromara/common/oss/core/OssClient.java b/ruoyi-common/ruoyi-common-oss/src/main/java/org/dromara/common/oss/core/OssClient.java
index 5e300da22..bde26ae1c 100644
--- a/ruoyi-common/ruoyi-common-oss/src/main/java/org/dromara/common/oss/core/OssClient.java
+++ b/ruoyi-common/ruoyi-common-oss/src/main/java/org/dromara/common/oss/core/OssClient.java
@@ -340,8 +340,8 @@ public class OssClient {
      * @return UploadResult 包含上传后的文件信息
      * @throws OssException 如果上传失败，抛出自定义异常
      */
-    public UploadResult uploadSuffix(byte[] data, String suffix) {
-        return upload(new ByteArrayInputStream(data), getPath(properties.getPrefix(), suffix), Long.valueOf(data.length), FileUtils.getMimeType(suffix));
+    public UploadResult uploadSuffix(byte[] data, String suffix, String contentType) {
+        return upload(new ByteArrayInputStream(data), getPath(properties.getPrefix(), suffix), Long.valueOf(data.length), contentType);
     }
 
     /**
@@ -353,8 +353,8 @@ public class OssClient {
      * @return UploadResult 包含上传后的文件信息
      * @throws OssException 如果上传失败，抛出自定义异常
      */
-    public UploadResult uploadSuffix(InputStream inputStream, String suffix, Long length) {
-        return upload(inputStream, getPath(properties.getPrefix(), suffix), length, FileUtils.getMimeType(suffix));
+    public UploadResult uploadSuffix(InputStream inputStream, String suffix, Long length, String contentType) {
+        return upload(inputStream, getPath(properties.getPrefix(), suffix), length, contentType);
     }
 
     /**
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
index 186653182..ba7c179c0 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysOssServiceImpl.java
@@ -195,7 +195,7 @@ public class SysOssServiceImpl implements ISysOssService, OssService {
         OssClient storage = OssFactory.instance();
         UploadResult uploadResult;
         try {
-            uploadResult = storage.uploadSuffix(file.getBytes(), suffix);
+            uploadResult = storage.uploadSuffix(file.getBytes(), suffix, file.getContentType());
         } catch (IOException e) {
             throw new ServiceException(e.getMessage());
         }