Abstract: In order to improve the accuracy of the cam grinding process，the lift error of cam grinding is studied．Genetic algorithm is used to correct the cam lift error． The measured cam lift value is adjusted by the software provided by the first machine tool plant in C city． The cam lift error and the theoretical cam lift value are taken as inputs，and the two order difference values are obtained by wavelet transform． The smooth two order difference of cam lift value is taken as the objective，and the genetic algorithm is used to correct the cam lift error． The simulation experiments show that this method can obtain a smooth cam lift values．

Key words: cam lift error, genetic algorithm, wavelet transform, two order difference value