In recent years, VLSI power problems have been paid more and more attention, especially the power consumption problem of CMOS circuit in battery powered portable devices. This paper studies on the low power design method of VLSI. Firstly, VLSI is introduced; then the VLSI power consumption source is analyzed; finally, several techniques to achieve low power consumption design of VLSI switch power are discussed. This paper has a certain positive significance for the electronic industry practitioners.