Abstract:The dynamic characteristics of dominant populations can show forest succession process.In this paper, the dynamoic characteristics of two mesophyte populations,Cryptocaryachinensis and Cryptocarya concinna, during succession in Dinghushan were studied.The mainresults were as follows:1. The niche breadths of the two populations increased gradually in the stage of needlebroad-leaved "dxed forest.This trend stopped in the stage of territorial seasonal evergreen broad-leaved forest.2.In the process of succession,the intensities of the distribution patterns fluctuated atlow-- intensitied clumped distribution with their dispersing, developing, self--licitted functionand other ecological factors.3. The coefficients of association and niche overlap between mesophyte populations andPinus massoniana population were relatively low in the stage of needle--broad --leaved "dxedforest,and dropped to zero in the stage when the heliophytes became dominant in the evergreen broad--leaved forest. Two values between mesophyte populations and heliophytepopulations turned from high to low during the whole period.These results showed the feature of mesophyte populations as the climax populations ofthe forest.