diff --git a/src/pages/courseDetail/components/introduce.vue b/src/pages/courseDetail/components/introduce.vue
index a64d3656..dcfdf226 100644
--- a/src/pages/courseDetail/components/introduce.vue
+++ b/src/pages/courseDetail/components/introduce.vue
@@ -62,7 +62,7 @@
 	});
 	const previewFile = info => {
 		previewFileFnc({
-			fileId: info.ossKey,
+			fileId: info.fileId,
 			getFileSrc: '/traapp/traFilePreview/',
 			fileName: info.fileName + '.pdf'
 		})