According to laser fabrication theory, a new three-dimensional (3D) laser beam coaxial powder feeding system was designed. The effect of technological parameters on laser cladding was analysed, and its function was discussed in industrial application. The results showed that the three-dimensional laser beam coaxial powder feeding system can rotate around vertical axis and can swing horizontal axis; the effect of cladding was in inverse proportion to the swinging angle of head at the certain parameters, then the ideal angle was 0°～45°; three-dimensional laser beam coaxial powder feeding system was used to repair parts especially irregular shape parts, such as crank shaft, screw, vane and so on by focusing powder flow and the function of a djustable focus.