The equal channel angular pressing (ECAP) process was used, the fourpass extrusion deformation of  6061 aluminum alloy was conducted at 110 ℃, and the influences of ECAP passes on mechanical properties of 6061 aluminum  alloy were investigated by the micro hardness measurements, tensile tests at room temperature and fracture analysis (SEM). Then, the friction coefficient and wear rate of 6061 aluminum  alloy under different ECAP passes were obtained by frictionwear test, and the wear surface morphology observation and energy spectrum analysis of specimen were conducted. The results show that with the increase of ECAP passes, the micro hardness and tensile strength of 6061 aluminum alloy increase，and the largest increase takes place in the first two passes. After four passes of ECAP, the grain size of material is refined significantly，and the micro hardness and tensile strength are up to 93.4 HV and 250.2 MPa, respectively. Moreover, the micro hardness distribution tends to be more uniform, and the material shows lower plasticity with ductile fracture. With the increase of ECAP passes, the wear resistance and oxidation resistance are greatly improved，and the average friction coefficient and wear rate decrease from 0.457, 0.028 mm3·m-1 of the first pass to 0.355, 0.014 mm3·m-1 of the fourth pass, respectively. Thus, the wear mechanism of 6061 aluminum alloy after ECAP process is a mixed wear mechanism dominated by abrasive wear and oxidation wear.