Abstract: There have not been many studies focusing on the operational methods for flood retarding area near Hongze Lake so far, and the previous studies often regard the whole flood retarding area to storing flood as one-time, once the flood retarding area is put into operation, the economic losses are huge. With the implementation of second phase II project of Huaihe River Sea-entering Channel, the discharge capacity in the lower reaches of Huaihe River will be improved and provide paves the conditions for the adjustments to the operation of the flood retard area of Honze Lake. According to the area's terrain and demographic characteristics, new partitioned flood retarding scheme is put forward and possible effects are estimated under existing situation and working conditions after the completion of second phase II project of Huaihai River Sea-entering Channel. The study also puts forward several suggestions regarding the future adjustments to the flood retarding area and safety facilities construction in flood retard area, which provide reference for optimizing the dispatching operation of the existed flood retarding area and pre-stage study on new flood retarding area near Hongze Lake.