The sifting stopping criteria of intrisical mode function(IMF) about empirical mode decomposition(EMD) and propose a new stopping criterion. In this paper, a measurement method is established to explain the infulence of the stopping criterion to empirical composition. The result indicates that these stopping criteria have a bad effect for EMD, thus a new stopping criterion is presented. The measurement method and simulation results show that the EMD has a better performance to reduce mode mixing using the new stopping criterion to the sift signal.