The laser gas nitriding is carried out on the surface of TA2 titanium alloy by use of the DL-HL-T 5kW continuous wave CO2 laser equipment. The stereo microscope，scanning electron microscopy, X-ray diffraction and energy spectrum analysis are adopted to analyze the surface morphology, microstructure and phase composition. The microhardness and uniformity of the hardness of the nitrided layers are measured by the microhardness tester and the nano indenter. The corrosion resistance of nitrided layers is analyzed by M283 potentiostat and M352 analyse software. The result shows that TiN is formed on the surface of TA2 which serves as a reinforcing phase. It is made up of nitrided layer, heat affected zone and the base metal after the laser gas nitriding treatment. The nitrided layer mainly consists of TiN and α′-Ti which has a uniform hardness with a thickness of 30 μm. The heat affected zone is mainly composed of needle α′-Ti. TA2 laser gas nitriding improves the uniform and localized corrosive resistance of the base metal.