TC4 titanium alloy material composed of Ti-6Al-4V, belongs to (a + b)-type titanium alloy having good mechanical mechanical properties. Than strength. The TC4 strength sb = 1,012 MPa, density G = 4.4 × 103, than intensity SB / g = 23.5, rather than steel strength sb / g less than 18. Titanium alloy with low thermal conductivity. The titanium alloy is 1/5 of the thermal conductivity of iron, aluminum 1/10, TC4 thermal conductivity l = 7.955W / m · K. Titanium and the low elastic modulus. TC4 elastic modulus E = 110GPa, approximately 1/2 of the steel, and therefore prone to deformation when machining titanium. TC4 (Ti-6Al-4V) and TA7 (Ti-5Al-2.5Sn) titanium alloy, using two injection solutions for surface modification, tests showed that the titanium alloy after ion implantation to improve the microhardness significantly reduced coefficient of sliding friction, effectively improve the wear resistance. proven its modification mechanism of injection and inject the sample X-ray photoelectron spectroscopy (XPS) analysis, with satisfactory results.