Abstract: Because of vitamin rich and sweet taste，late maturing navel orange has become one of the most popular fruit.Fengjie county of Chongqing city has unique natural condition to plant late maturing navel orange.And late maturing navel orange has become important local characteristic agricultural products.But preharvest drop phenomenon of late maturing navel orange is serious.It affects the yield and quality of navel orange and fruit grower income.Effective experience and prevention and control technology of dealing with late maturing navel orange preharvest drop in Fengjie county were analyzed.