Tropical peat swamp forest comprise peat domes and distribute to Southeast Asia. Catenary sequence of vegetation can be seen and the sequence has been attributed to peat depth and its resulting reduced nutrient availability. This is an ecological process that explains the community assemblage, while other ecological process such as biotic factor has hardly been investigated. Anyalyzing phylogenetic structure of communities can be used to infer the relative importance of ecological process operating on community assemblages. In the presentation, we analyzed phylogenetic structure of peat swamp plant community to clarify the role of biotic and abiotic factors on inter- and intra- peat dome plant communities.