The wind plays an important role in different hydrologic phenomenon such as spatial distribution of snow accumulation. In order to compare the function of the wind in different locations of the basin, a magnitude called wind shelter index is being used, which its calculation encounter special difficulties because of its need to various information. An algorithm has been presented in order to reach an efficient method to determine wind shelter index. The results showed that the presented algorithm can be used more easily by the users, and it is more qualified for calculating wind shelter index of all the optional locations placed on the surface of the basin, in comparison to the direct method of calculating wind shelter index.