In this paper, the authors studied the coseismic deformation in Ukraine River valley in Tianshan Mountains, and reconstructed digital elevation modle (DEM) graph of 12.5 m spatial resolution for the study area before and after the earthquake using the ALOS / PALSAR data by InSAR remote sensing technique. Then the authors obtained the remote sensing characteristics of seismic collapse of earthquake by difference method of the DEM after the field verification by RTK calibration. The results show that: ①The area of the collapse of the triangle is 104.47 million m ², the collapse is 1 416.60 million m ³, the starting elevation is 3 225 m, the average slope is 48°, and slope direction is NNW. ②The trumpet-shaped accumulation body area is 78.61 million m ², the accumulation is 1 424.27 million m ³, and the buried depth is between 35 m and 80 m. ③The river bed was pushed northward by 100 m, and the eastward advance reached 300 m, due to the accumulation body of the south of the river channel. ④Collapse of the body led to the the formation of quake river. The surface area of the lake increased from 0.039 km ² to 0.059 km ² within 30 days and the lake area reached the peak of 0.146 km ² in 2010. ⑤The factors responsible for the collapse included not only seismic activity but also limestone lithology, terrain slope, fault structure and other comprehensive factors.