Abstract: This paper introduces the WQRRSR and the simulation model for reservoir aquatic ecological system,and analysed the principle of aquatic ecological process in reservoirs and its numerical simulation method,In addition,by adopting the WQRRS model,the ecological diversifying process in Danjiangkou reservoir in 1995 is simulated day by day.The hydrological data,meteorologic data,initial water quality data,dispatch data of Danjiangkou reservoir and water quality data of tributary inflow during 1995 are used for the simulation.