The dynamic storage coefficient method was used in river flood routing of Xinanjiang model so as to improve the model.Based on the hydrological data of Yingjiang hydrological station in the Yingjiang River basin from 2000 to 2010,the paper analyzed the applicability of improved Xinanjiang model,and compared the result of the model with that of traditional.It used the improved model to analyzed the impact of different calculation steps and evaporation inputs on hydrology simulation. Result showed that the improved Xinanjiang model is suitable for the runoff simulation in the research watershed. Compared with the traditional Xinanjiang model,the relative error and uncertainty factor of the improved model can be improved, the relative error decreased by 1.08%,the uncertainty factor increased by 0.0182;the shorter the computing time,the higher the simulation precision;Comparing with the measured evaporation pan, the relative error of year runoff depth of dual-source evapotranspiration reduced 0.8%, and the uncertainty factor of that increased 0.0139 respectively.The result can provide a reference for the hydrology simulation of Yingjiang River basin.