Based on WRF-Chem model, the seasonal differences in the transportation of black carbon aerosols from surrounding areas to the Qinghai-Tibet Plateau were studied, and the possible reasons were analyzed. Results show that the average concentration of black carbon aerosols near the surface of the Qinghai-Tibet Plateau is the lowest in summer and the highest in spring. The local black carbon aerosols on the Qinghai-Tibet Plateau mainly come from South Asia, followed by Southeast Asia, and China's contribution is relatively small. In spring, the black carbon aerosols from South Asia are mainly transported to the plateau through dry deposition, while in summer, only a small amount of black carbon aerosols are transported from China to the northeast of the Qinghai-Tibet Plateau through wet deposition; in winter, black carbon aerosols near the surface of the Qinghai-Tibet Plateau are transported from South Asia through dry deposition.