Based on the statistical optimization method of circuit design centering proposed by Soin and Spence (1980), a modified yield maximization technique, moving center of gravity, is suggested. This method is satisfactory in solving circuit yield maximization when the circuit initial yield is zero. The two modified strategies are given. Finally, in order to show feasibility and usability of this method, examples of the TV circuit (CS54E-3-R) and IC(XD1531) optimal yield are given.