Fault activity in an area of 500000 km2 in the western Kunlun and southwestern Tianshan Mts. was anal-ysed and interpreted based on multispectral and multitemporal satellite images. Geomorphic and microgeomor-phic features and structural assemblages on the images suggest 3 categories of active faults, recent, Late Pleis-tocene and indefinite faults. In accordance with seismic activity, earthquake risks in the area were analysed. The results showed: the active belt of the Bulunkou structural assemblage in the western Kunlun may be the cause of a series of strong earthquakes at Wuqia (Ulugqat), Artux, Jiashi (Payzawat) of the southern Tian-shan mountain in the 20th century.