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In this study, we took no quadrat sampling method to quantitatively analysis on biomass allocation and component allometry of the Phragmites austral is in Wuhan and Shenyang wetlands. Variance analysis showed that the two reed components in biomass allocation of the Phragmites austral is in Wuhan and Shenyang wetlands were significant different. Regression analysis showed that biomass accumulation relationships between leaves and stems components and tiller of Phragmites austral is belonged to allometry, and growth relationships among different components subjected to resource constraints. Different components showed different rate of biomass accumulation in different habitats, which were growth and resource allocation strategy of environmental adaptation. [ABSTRACT FROM PUBLISHER]