In order to study the influence of the tool wear on the surface quality of the TC11 in the milling process,the experiment between the tool wear and the milling surface roughness and the surface residual stress was designed.The results show that the tool wear in the milling process of the TC11 can be divided into three stages: the initial wear,the normal wear and the severe wear.When the tool is in “the initial wear”,the surface roughness of the TC11 decreases gradually with the cutting time,and the residual stress of the milling surface also decreases.When the tool is in“the normal wear”,both the milling surface roughness and the surface residual stress increase,but the increasing rate is stable.When the tool is in “the severe wear”,the surface roughness increases rapidly,and the surface residual stress increases significantly compared with the previous two stages.In addition,the surface residual stress of the TC11 during the test process are all in compressive stress.