Remote sensing technologyhas the dominance of macrocosm, intuitiveness, efficiency, along with not subject to external factors. So it has a great advantage in the study of active faults. This paper systematically summarizes the remote sensing interpretation signs of active faults, and using Landsat ETM, ALOS, ASTER GDEM and Google earth image data, combined with previous research results as well as geologic survey of key areas to study the Litang left lateral strike slip active fault zone, which located in eastern Tibet western Sichuan plateau, southeastern margin of the Tibetan Plateau. The research shows that the Litang fault zone is a discontinuous northwest southeast arc which about 400km. Based on the geometric features to divide the fault zone into five sections, from northwest to southeast are: the Kagong fault, the Zhangde fault, the Maoyaba fault, the Litang fault and the Kangga Dewu fault. Analysing the image signs, offset geological features and seismicity of the different fault sections, we found that the southern activities is stronger than the northern, especially the Maoyaba Litang Dewu fault section This result may suggest that the Tibetan Plateau eastward extrusion rate has a tendency to speed up from west to east.