27SiMn steel hydraulic support is prone to defects such as corrosion,abrasion and fatigue damage on their surface after long time use under harsh working conditions.In order to improve its service life,broadband laser cladding technology is used on the surface of 27SiMn Steel for the preparation of iron based coatings in this paper.Based on the method of control variables,the laser power,powder feeding speed,carrier gas flow rate and scanning speed were adjusted in sequence to carry out single pass single factor cladding test,and the surface roughness was used as the initial selection process parameter of the cladding layer quality evaluation index.The 4 factor 3 level orthogonal test was further conducted based on the single factor test,and the microhardness was finally selected as the quality evaluation index of the cladding layer.It is found that the scanning speed has the greatest impact on the microhardness of the cladding layer,followed by laser power,gas flow and powder delivery speed through the range analysis of the research data.The optimal process parameters are cladding at the laser focal point and laser power,powder feeding speed,carrier gas flow and scanning speed are 4000W,2.50 rpm,6.9 L/min and 600 rpm,respectively.At the same time,a friction and wear test was carried out on the cladding layer,and the friction coefficient,wear rate and wear form were analyzed to verify the feasibility of optimization of process parameters.Finally,it is concluded that the average hardness of the cladding layer is 2.2 times that of the matrix,and the wear rate is 27% of that of the matrix.Through the optimization of the process parameters,the surface hardness and wear resistance of the iron based alloy cladding layer can be significantly improved,which is very beneficial to the cladding repair of the 27SiMn hydraulic support.