diff --git a/collection/uni-cms-articles/collection.json b/collection/uni-cms-articles/collection.json
index 17f0337..d6fde80 100644
--- a/collection/uni-cms-articles/collection.json
+++ b/collection/uni-cms-articles/collection.json
@@ -124,11 +124,11 @@
         "foreignKey": "uni-id-users._id"
       },
       "thumbnail": {
-        "bsonType": "string",
+        "bsonType": "array",
         "title": "封面大图",
         "description": "缩略图地址",
         "label": "封面大图",
-        "trim": "both"
+        "defaultValue": []
       },
       "publish_date": {
         "bsonType": "timestamp",
diff --git a/collection/uni-cms-articles/schema.json b/collection/uni-cms-articles/schema.json
index d4f2243..60ef8cc 100644
--- a/collection/uni-cms-articles/schema.json
+++ b/collection/uni-cms-articles/schema.json
@@ -123,11 +123,11 @@
       "foreignKey": "uni-id-users._id"
     },
     "thumbnail": {
-      "bsonType": "string",
+      "bsonType": "array",
       "title": "封面大图",
       "description": "缩略图地址",
       "label": "封面大图",
-      "trim": "both"
+      "defaultValue": []
     },
     "publish_date": {
       "bsonType": "timestamp",