Abstract:The article is a part of the “research on productivity and ecological borderline effect of ecology economy system in Dayawan Bay, Guangdong Province, South of China”. The typical sampling and transect methods are principally used for the community structure and quantitative characteristic of mangrove forest in Dayawan Bay. The quantitative parameters such as the diameter, height, growth rate, storage volume, growth volume, consumption volume and the primary productivity of the mangrove plant species are measured. This research work is an important foundation of studying ecological borderline effect of the special plant community at the border area between the land and the sea.