Grinding is one of the most extensive manufacture technics. Grinding process becomes very complex and difficult to analyze, because the distribution of abrasive grains is stochastic and abrasive grain geometrical shape is anomalistic. So the research on grinding locomotion gets into corner. The application of computer simulation in grinding process can availably analyze the effect brought by many complicated factors in the process. So the paper advances some suppositions and simulates the process based on AutoCAD & AutoLISP. An equation of process track is educed .The simulation makes the grinding process become intuitionistic. It is also very useful to the analysis of grinding.