In the process of laser cladding，all kinds of defects or deficiencies on the repairing surface will be caused because of the process parameters,equipment performance,cladding powder and other reasons,in which the surface topography of cladding layer will be influenced by the liquidity of powder in the bath directly.In addition,the presence of oxygen will lead to the morphology of spiracle in the surface of cladding layer in the cladding process.Analysis through the experiments shows:the liquidity of powder-pool will increase effectively by adding right amount Al powder in the laser cladding process.Simultaneously,Al2O3 generated from the combination of Al and O will protect the surface of the cladding layer and does not reduce the hardness.When the quality score of 1% of Al powder is added in the YG12,cladding layer,the hardness increases,and proportion is appropriate.