Based on the author's research on the natural distribution and taxonmy of genus Malus in the world and considering the theories N.I.Vavilov,V.T.Langenfeld,C.A.Stace and Yu Te-Tsun, involving the origin and evolution center of genus Malus, the author believes that the origin and evolution center of genus Malus is located in the southwestern part of China, namely, in Sichuan, Yunnan and Guizhou province, but the ancestor species of genus Malus are not all originated in these province or Southeast Asia; some o...