diff --git a/scripts/tag/oss-image.js b/scripts/tag/oss-image.js
index eb01161..3f4f1fb 100644
--- a/scripts/tag/oss-image.js
+++ b/scripts/tag/oss-image.js
@@ -14,17 +14,17 @@ hexo.extend.tag.register('oss_image', function(args) {
     let altMessage = args[2] || '';
     attrs.push(`alt="${altMessage}"`);
 
-    let classes = args[3] || '';
+    let classes = args[5] || '';
     if (classes.length !== 0) {
         attrs.push(`class="${classes}"`);
     }
 
-    let width = args[4] || 0;
+    let width = args[3] || 0;
     if (width !== 0) {
         attrs.push(`width="${width}"`);
     }
 
-    let height = args[5] || 0;
+    let height = args[4] || 0;
     if (height !== 0) {
         attrs.push(`height="${height}"`);
     }