diff --git a/g/database/gdb/gdb_func.go b/g/database/gdb/gdb_func.go
index d0636c685..e5499291f 100644
--- a/g/database/gdb/gdb_func.go
+++ b/g/database/gdb/gdb_func.go
@@ -66,6 +66,7 @@ func formatCondition(where interface{}, args []interface{}) (newWhere string, ne
                     for i := 0; i < rv.Len(); i++ {
                         newArgs = append(newArgs, rv.Index(i).Interface())
                     }
+                    // counter用于匹配该参数的位置(与index对应)
                     counter    := 0
                     newWhere, _ = gregex.ReplaceStringFunc(`\?`, newWhere, func(s string) string {
                         counter++
diff --git a/g/database/gdb/gdb_model.go b/g/database/gdb/gdb_model.go
index c8a9d69da..2534b3430 100644
--- a/g/database/gdb/gdb_model.go
+++ b/g/database/gdb/gdb_model.go
@@ -136,12 +136,13 @@ func (md *Model) Filter() (*Model) {
     return model
 }
 
-// 链式操作，condition，支持string & gdb.Map
+// 链式操作，condition，支持string & gdb.Map.
+// 注意，多个Where调用时，会相互覆盖，只有最后一个Where语句生效。
 func (md *Model) Where(where interface{}, args ...interface{}) (*Model) {
     model             := md.getModel()
     newWhere, newArgs := formatCondition(where, args)
     model.where        = newWhere
-    model.whereArgs    = append(model.whereArgs, newArgs...)
+    model.whereArgs    = newArgs
 	// 支持 Where("uid", 1)这种格式
 	if len(args) == 1 && strings.Index(model.where , "?") < 0 {
         model.where += "=?"