diff --git a/chain.go b/chain.go
index 81c66d5..3a98af1 100644
--- a/chain.go
+++ b/chain.go
@@ -266,7 +266,11 @@ func (this *Query) BuildSelectSql() (map[string]interface{}, error) {
 	} else {
 		title = "*"
 	}
-	sql = helper.StringJoin("/*slave*/ select ", title)
+	if DB_PROVIDER == "TencentDB" {
+		sql = helper.StringJoin("/*slave*/ select ", title)
+	} else {
+		sql = helper.StringJoin("select ", title)
+	}
 
 	if this.alias != "" {
 		table = helper.StringJoin(table, " as ", this.alias)
diff --git a/conn.go b/conn.go
index d07a68d..06b0a18 100755
--- a/conn.go
+++ b/conn.go
@@ -17,6 +17,9 @@ var DB *sql.DB
 
 var SLAVER_DB *sql.DB
 
+//db类型,默认空，如TencentDB（腾讯）,
+var DB_PROVIDER string
+
 func Connect(DBHOST, DBUSER, DBPWD, DBNAME, DBPORT string, conns ...int) error {
 
 	log.Println("database connectting...")
diff --git a/db.go b/db.go
index 145c49b..c464abb 100644
--- a/db.go
+++ b/db.go
@@ -316,8 +316,11 @@ func GetRow(dbName, table_name, alias string, titles string, join [][]string, wh
 	} else {
 		title = "*"
 	}
-	sql_str = helper.StringJoin("/*slave*/ select ", title)
-
+	if DB_PROVIDER == "TencentDB" {
+		sql_str = helper.StringJoin("/*slave*/ select ", title)
+	} else {
+		sql_str = helper.StringJoin("select ", title)
+	}
 	if alias != "" {
 		table = helper.StringJoin(table, " as ", alias)
 	}
@@ -463,8 +466,11 @@ func FetchRows(dbName, table_name, alias string, titles string, join [][]string,
 	} else {
 		title = "*"
 	}
-	sql_str = helper.StringJoin("/*slave*/ select ", title)
-
+	if DB_PROVIDER == "TencentDB" {
+		sql_str = helper.StringJoin("/*slave*/ select ", title)
+	} else {
+		sql_str = helper.StringJoin("select ", title)
+	}
 	if alias != "" {
 		table = helper.StringJoin(table, " as ", alias)
 	}