Abstract: This paper, by analyzing the traditional master switch method based on the AHB bus architecture, putting forward three new master switch methods, and also giving the key circuit design of there method and making a comparison of the simulation results. For further more, in order to provide a comprehensive basis for readers selecting a appropriate method to the master switch in different conditions, the paper also gives out the simulation results of the four methods, and make an analysis of there results, and compares the advantages and disadvantages of there methods.