diff --git a/app/Model/ArticleScience.php b/app/Model/ArticleScience.php
index 6328121..916015c 100644
--- a/app/Model/ArticleScience.php
+++ b/app/Model/ArticleScience.php
@@ -108,7 +108,7 @@ class ArticleScience extends Model
                 $query->where($article_science_class_params);
             });
 
-        $result = $query->orderBy("is_top")->paginate($per_page, $fields, "page", $page);
+        $result = $query->orderBy("is_top","desc")->orderBy("created_at","desc")->paginate($per_page, $fields, "page", $page);
 
         $data = array();
         $data['current_page'] = $result->currentPage();// 当前页码
@@ -148,7 +148,7 @@ class ArticleScience extends Model
                 $query->where($article_science_class_params);
             });
 
-        $data = $query->orderBy("is_top")->limit($limit)->get($fields);
+        $data = $query->orderBy("is_top","desc")->orderBy("created_at","desc")->limit($limit)->get($fields);
 
         return $data;
     }