diff --git a/aliyun-oss-wordpress.php b/aliyun-oss-wordpress.php
index a080090..5d1b4be 100644
--- a/aliyun-oss-wordpress.php
+++ b/aliyun-oss-wordpress.php
@@ -404,7 +404,7 @@ function oss_setting_content_style($content)
         if (!empty($images) && isset($images[1])) {
             $images[1] = array_unique($images[1]);
             foreach ($images[1] as $item) {
-                if(strpos($item, $option['upload_url_path']) !== false){
+                if((strpos($item, $option['upload_url_path']) !== false) && (strpos($item, $option['style']) === false)){
                     $content = str_replace($item, $item . $option['style'], $content);
                 }
             }
@@ -422,7 +422,7 @@ function oss_setting_post_thumbnail_style( $html, $post_id, $post_image_id )
         if (!empty($images) && isset($images[1])) {
             $images[1] = array_unique($images[1]);
             foreach ($images[1] as $item) {
-                if(strpos($item, $option['upload_url_path']) !== false){
+                if((strpos($item, $option['upload_url_path']) !== false) && (strpos($item, $option['style']) === false)){
                     $html = str_replace($item, $item . $option['style'], $html);
                 }
             }