Abstract: For the treatment process of activated sludge method,a simulation method with three-dimensional cellular automation model is proposed.The method simulates the dynamic evolvement of activated sludge treatment process in the bioreactor,and the treatment process is reflected intuitively.Actual data is used to prove that the method could show the treatment process of activated sludge method effectively.The visualization is realized,and the growth curve of activated sludge is also plotted.