Optimal allocation of water resources for irrigation is limited to the algorithm at present.Combined the characteristics of water resources in the irrigation district of Manas river,the article adopted WRMM[5] model which was developed by Alberta,Canada.The model can simulate the water supply process and reservoir inflow,and out flow process for each irrigation district and urban in the Manas River basin.The results showed that the model simulated with good results,it has certain directive significance to t...