The Leslie matrix is used to analyse the population data of the Qingping commune in Peng county, Sichuan province and to evaluate the effect of the induced abortion on the population control.The future thirty-year population is predicted by the twosex model. The female stable age distributions are given by the basic female Leslie matrix. The calculating results show that because the induced abortion is adopted the population of this commune will decrease successively in the recent thirty years. If these mea...