Abstract: The mode of slipping along the eastern segment of altun fault zone is analyzed through both macroscopic investigation and microscopic study. The results show that:(1) the eastern segment of Altun fault zone consists of en echelon subsidiary faults.It seems that creep slip will easily occur along the segment, where the angle between the subsidiary faults is less than 15;(2) strong preferred orientation, augen structure, and small shear angle developed within the fault materials are the indications of creep slip along the eastern segment of Altun fault zone;(3) scanning electron micoscopic observation of quartz grains from the fault gouge has revealed that the recent movement along the eartern segment of the Altun fault since Q 3 is dominated by creep slip, but the intensity of slip is variable at different positions of the segment.The mode of movement along the eastern segment of the Altun fault zone was dominated mainly by creep slip, and the intensity of creep slip increases toward the east.