As a precision grinding technology,swing grinding has shown strong superiority in cam profile grinding.However,the current research on swing grinding technology is not deep enough and the matching study of various grinding parameters under the swing grinding method is not systematic enough.In order to give full play to the technical advantages of swing grinding and realize the deep integration of grinding parameters and other parameters,the surface roughness parameters Ra,Rz and Rsm of swing grinding were investigated by using 40Cr steel camshaft as test material.Based on the grey correlation theory,the measured roughness results were deeply analyzed,and the optimization problem of multiple process indexes was transformed into a single objective grey correlation degree optimization problem.The optimal process parameters were obtained as grinding depth of 0.003 mm,workpiece speed of 2 600 mm/min,swing frequency of 60 times/min and swing amplitude of 1.5 mm.The experimental results show that the combination of process parameters can obtain more ideal grinding surface quality.