Since the 175 m test-operation of the Three Gorges Resevoir (TGR)，the sedimentation law of Zhanqizi waterway，which is in the Three Gorges Reservoir tail，has changed.The sediment accumulation brings about navigation problems during the sluicing period，so maintenance and dredging is very necessary for ensuring unimpeded passage. Sediment accumulation of Zhanqizi waterway is mostly because of the storage in the flood recession period and the main stream is dispersed during the sluicing period.This paper analyzes the sediment changes characteristics and causes of this change annually and inter-annually and offers proposals for the waterway maintenance in the days to come.