Two-stage sequential stopping procedure is used for terminating simulation analysis. It can control precision of result data that is required, but cannot avoid redundancy computation and early stopping. Firstly, the existing stopping procedures of terminating simulation were reviewed; then, the relationship between the quantity estimating of the samples total needed and the current amount of the samples usable was analyzed; finally, a modified method based on parameter steady-state estimate was proposed. This method can improve estimating of n (samples total needed) if the n is biggish, and ensure the validity of the simulation result. It can increase go-aheadism for the procedure actualizing.