The research on snowmelt and rainfall runoff and the application of flood forecasting is restricted in high cold alpine areas because of the complexity of precipitation distribution law, the variability of snowmelt factor, the lack of monitored data and so on. Considering the distributed hydrological model reflects some advantages in snowmelt runoff and flood-forecast research, so the distributed hydrological model is built in Tianshan Mountain areas based on the Xinanjiang Model using DEMs, GIS tech...