Abstract: Leakage power of SRAM is important index to meet in VLSI design, and the leakage power analysis and estimation is a problem to solve. Under analyzing the operation theory of SRAMs, some power models were established for each part of the SRAMs which playing different roles in various operational phases.The simulation result shows the leak-age power of SRAM could be estimated quickly basing on the presented model and the deviation is smal1.