Large-area laser cladding is formed by multiple overlaps. At present,laser cladding is widely used in industrial production applications,and the laser cladding processing scale of hydraulic support columns for mining is the largest. However,pores,trachoma and cracking have become prominent common problems in the laser cladding industry. In order to control the cladding per formance of stainless steel columns and reduce defects,27SiMn hydraulic support column is used as the base to carry out multi-lapping laser cladding procedure experiment. The lap zone of multi-lapping cladding and its influence on corrosion resistance are discussed. The multi-lapping cladding procedure test is performed by adjusting the cladding steps,and the influence of cladding flatness and dilution rate on the finished column products is analyzed,and the metallographic microstructure of the cladding layer is also analyzed. The results show that there are differences in the microstructure of the lap zone,and it is easy to have defects such as pores and sand holes. Weak corrosion resistant area is around the exposed lap wire on the column surface after machining,so the standardized procedure should be strictly implemented to ensure the performance of this area;the cladding flatness needs to be controlled within 0.03 mm;the cladding layer whose dilution rate is controlled within 10% has flat surface and uniform microstructure,and is metallurgically bonded to the substrate.