The Bayan Har block is mainly bounded by the east Kunlun fault zone to the north,Garzê-Yushu-Xianshuihe fault zone to the south and Longmenshan fault zone to the east(Fig.1).In the past 20 years,large earthquakes have occurred frequently along this block’s boundaries,which has received much attention among geoscientists.Whether large earthquakes will happen(and where)along this block’s boundary faults in the future are two key problems that need to be addressed.This study calculates the accumulated tectonic stress and superposition of the The Bayan Har block is mainly bounded by the east Kunlun fault zone to the north, Garzê-Yushu-Xianshuihe fault zone to the south and Longmenshan fault zone to the east (Fig.1) .In the past 20 years, large earthquakes have occurred frequently along this block’s boundaries, which has received much attention among geoscientists. WHhether large earthquakes will happen (and where) along this block’s boundary faults in the future are two key problems that need to be addressed.This study calculates the the accumulated tectonic stress and superposition of the