Abstract: A cellular automata method with determined step length was used to simulate normal grain growth,and the influence of step length on the simulation results was investigated.Within the same equivalent time,the use of a larger step length leads to a smaller grain size,the grain size distribution accords well with the Weibull function,and the correlation between grain area ratio (An/Aa) and grain sides is closer to a linear relation.Whichever step length is used,the average grain sides in the simulation process are close to 6,the distribution of grain sides after simulation accords with the normal distribution,and the agreement is improved with the decrease in step length.In a comprehensive consideration,a step length of 100 s is in favor of simulating the grain growth of actual materials.