The characteristics of population variation and species diversity in succession processes of Karst vegetation in Yangshuo in Guangxi have been studied by a spatial series representing temporal series.The results showed that,with the development of succession,shade-tolerant populations and tree populations increasedt,he replacement of dominant species took on certain continuity,the dominant species of the process have hided in the former community;in the process of succession the species richness revealed the tendency of herbosa<deciduous broad-leaved forest<brush<evergreen-deciduous broad-leaved mixed forest in every succession stages,the richness in shrub layer was highest than other layers,and the community evenness in deciduous broad-leaved forest stage was highest among four succession stages.