Abstract: In order to improve the performance of TC11 titanium alloy surface, the strong laser irradiation treatment was used, and then the influence of laser pulse energy density on TC11 titanium alloy surface morphology and performance was studied. The results show that after the laser irradiation by strong laser pulse of 1J/cm², the surface of the alloy begins to melt, and with the increase of pulse energy density, the outer diameter of the molten hole in the alloy surface becomes larger. After laser irradiation, a micropore with outside diameter of about 1.5μm formed at the surface of the alloy, whose constituent elements were mainly Mg, O, S and C. The microhardness of TC11 alloy was significantly increased after pulse irradiation. When the pulse energy density increases, the microhardness of the alloy increases, and the anti-oxidation performance of the alloy sample is obviously improved. The oxides formed on the surface of the alloy consist of two types: Granule and lamellar. The oxide is mainly composed of Al₂O₃ and Cr₂O₃. The study is helpful to improve the surface properties of TC11 titanium alloy.