Constructing sluices is widely used as an important way of estuarine regulation in China, which will lead to severe siltation downstream estuarine floodgates while promoting the local economic development and limiting the comprehensive use of estuary. This paper describes the siltation downstream sluices and elaborates the silting mechanism and simulation study at home and abroad on this problem. Many factors influencing the siltation pattern are summarized including the tidal current, the length of irrigation channel, dynamic features of estuarine sediment, the types of rivers downstream sluices, location of sluices, etc. The defects existing in the previous study are illustrated and suggestions are given to the direction and methods of future study.