Abstract：In Northwest China, glacial melt represents a very significant source of streamflow, especially in arid and semi-arid inland river basins. Degree-day model has been widely applied in the estimation of meltwater, and the Degree-day factor is an important parameter in model, the model can not simulate well the change of ablation during the year when use a fixed value of Degree-day factor. And the research of study on the spatial sparameterization schemes of Degree-day Factors in a valley glacier of Tomur in Tianshan has not yet commenced. This item will rely on the observation system of Koxkar Glacier Basin Filed station, it draws up to observed the ablation of glacier and snow which consider the slope and the thinkness of debris-covered in different altitude. We will study on the spatial and temporal difference of degree-day factors and analysis the regular pattern of variation on the valley glacier based meteorological data in glacier area. And we analysis the relationship between Degree-day factor and the thickness of debris, temperature, sonw, the movement of glacier and terrain. Considering that, this item will improve parameterized scheme of distributed glacial ablation model and couple the degree-day mass-balance model with HBV model which considered the spatial change of Degree-day factors. On this basis, the extended HBV model will be applied to simulate the hydrological processes in the Koxkar Glacier Basin, and the result will also be cpmpared with observation data and simulated result of original model which consider the single-factor degree-day, then we discuss the estimation and composition of glacial runoff which was influenced by the spatial and temporal difference of degree-day factors in hydrological model. Finally, we intend to provide reference for spatial sparameterization schemes of Degree-day factors in the glacier hydrological model .