Effect of different texture density on tribological properties of titanium alloy was studied under heavyload sliding friction.The carbonbased film was prepared on the texture surface of titanium alloy with the best wear resistance,and the tribological properties were compared with those of the carbonbased film prepared directly on the surface of titanium alloy.Results show that the friction coefficient and the wear rate of TC4 titanium alloy are decreased under three low texture density conditions.With the increase of texture density,the friction coefficient of titanium alloy changes little,but wear rate is increased.The friction coefficient of the carbonbased film deposited on the titanium alloy texture surface with texture density of 5.95% is lower than that of the carbonbased film directly on the titanium alloy surface due to the small turbulence in texture concave.The wear rate of the textured carbonbased film is 99.31% lower than that of titanium alloy,and about 60% lower than that of carbonbased film prepared directly on titanium alloy surface.This is because the graphitization transition is triggered in the process of high contact stress friction,and the worn graphitized particles are embedded into the texture concave,which inhibits the wear behavior of the frictioncontact interface.