diff --git a/business/model/common.go b/business/model/common.go
index d5dd49904..63430f605 100644
--- a/business/model/common.go
+++ b/business/model/common.go
@@ -18,7 +18,7 @@ type DataResource struct {
 	ResoureType string `orm:"size(48)" json:"resoureType"` // 资料的mime type
 	Name        string `orm:"size(48);index" json:"name"`
 
-	MainURL  string `orm:"size(512);column(main_url);index" json:"mainURL"`
+	MainURL  string `orm:"size(512);column(main_url);unique" json:"mainURL"`
 	QiniuURL string `orm:"size(512);column(qiniu_url);index" json:"qiniuURL"`
 	EbaiURL  string `orm:"size(512);column(ebai_url);index" json:"ebaiURL"`
 	MtwmURL  string `orm:"size(512);column(mtwm_url);index" json:"mtwmURL"`