Abstract: The tropical forests of Jianfengling are divided into twenty-six forest types by using the method of principal component ordination. According to the value of importance of the genera in the sample areas, the general species and rare species which are of minor importance have to be rejected so as to reduce the statistic data. In the light of some specific site factors and specific distribution of species, the sample areas are preliminarily divided into groups, and then the principal component ordination analysis is applied in groups.