Ti-6al-4v titanium alloy, belonging to (A + B) type titanium alloy, has good comprehensive mechanical properties. Greater than strength. The strength sb=1.012GPa, density G =4.4*103 and specific strength Sb/G =23.5 of Ti-6Al-4V, while the specific strength Sb/G of alloy steel is less than 18. Titanium alloy has low thermal conductivity. The thermal conductivity of titanium alloy is 1/5 of iron and 1/10 of aluminum, and the thermal conductivity of TC4 is L =7.955W/m·K. Titanium alloy has low elastic modulus. The elastic modulus E=110GPa of Ti-6Al-4V is about half that of steel. Titanium alloy is prone to deformation in the process of machining. The surface modification of Ti-6Al-4V(TC4) and Ti-5Al-2.5Sn(TA7) titanium alloys was carried out by two injection methods. The experimental results show that the microhardness of titanium alloy is improved, the sliding friction coefficient is significantly reduced, and the wear resistance is effectively improved after ion implantation