By using 6-axis robot and inside laser powder feeding technology to form the arcuate cantilevered entity part, and a way of variable posture and radial overlap laser cladding was proposed. This experiment discussed the cladding nozzle self-healing effect and deduced the quantitative relation between the single track height and the laser defocus when the defocusing amount ranged from -5.5 mm to -1.5 mm, and verified it by experimrent. The experiment result shows that the surface of formed part is flat and smooth without staircase effect; the thickness and length of formed part are uniform under different angle, and all the dimension precision meet the requirements of modeling, different angle almost has the same microstructure.The hardness keeps the same change rule with microstructure by testing the forming part hardness.