The shallows development in the Yangtze River downstream utilizes the flexible mattress to protect the foundation.Due to the large beach topography of the shallows,tidal influence and bad depth conditions,it is difficult for the flexible mattress’ construction and targeted construction ship machines and construction technology shall be chosen.Based on the conditions of the flexible mattress construction in the tidal river,this paper expounds the construction ship machines,construction technology and quality control points in the deepwater and shallow areas,especially,the gasbag is adopted to complete the construction of flexible mattress successfully in the shallow area,which provides reference for similar engineering construction of tidal flat reclamation.