Abstract: Using summer precipitation data from 1970 to 2015 and high-resolution satellite remote sensing data, the long-term plateau snow depth data simulated by the BCC-CSM(m) climate system model was evaluated. The spatiotemporal evolution characteristics of snow cover over the Tibetan Plateau and its impact on summer precipitation in surrounding areas were also investigated. The results indicate that: (1) The large-value areas of snow depth simulated by the BCC-CSM(m) model are mainly distributed between the Himalayas and the Kunlun Mountains in the western part of the plateau, with a decreasing trend from the Karakoram Mountains to the surrounding areas. (2) The interannual variation of snow depth simulated by the BCC-CSM(m) model shows a decreasing trend compared to observational data. (3) The BCC-CSM(m) model can well simulate the spatial distribution changes of snow depth in different seasons. (4) The snow cover over the main body of the plateau can be divided into four patterns: overall more snow, overall less snow, more snow in the north and less in the south, and less snow in the north and more in the south. (5) Different distribution modes of snow cover in the winter half-year on the plateau cause differences in the distribution of summer precipitation in the southwest and northwest regions.