The velocity of glacier is the most important parameter in the study of glaciers and remote sensing is a powerful tool to calculate their surface velocities.Due to persistent cloud cover in this region,it is not possible to acquire enough optical images to provide measurements.However,measurement of the offsets between two SAR images is an effective way to determine surface velocity.In order to do this,offsets both in slant range and azimuth directions are derived from two SAR images with offset-tracking method.The movement of the glacier during the SAR data acquisition time is calculated after the global part of offsets have been removed using the polynomial fit method.The offsets used for removing the global part are selected on the basis of the Single-to-Noise ratio (SNR)and correlation in area without glaciers but with large topographic changes.The surface velocity of the whole glacier using SAR data is a first in China,and which may make a significant contribution to the study of glacier dynamics.The Mt.Muztaga Ata is an important glacier distribution area in western China.There are more than ten big glaciers distributed in this region.The Muztaga glaciers have their different characteristics in the motion style,based on the velocity map.