Abstract: The characteristic of population structure in three types of typical agroforestry models,namely,the model of Ginkgo biloba leaf utilization garden(A),the model of Ginkgo biloba leaf and fruit utilization crop garden(B) and the model of Ginkgo biloba wood utilization crop garden(C),commonly practiced in the seacoast in Jiangsu Province,were studied by anaylysing the compound structure and growth structure of plant,the realized niche and biodiversity.The results are as follows:The Ginkgo biloba leaf and fruit utilization Leguminous crop compound model have the largest value index of species diversisty and the smallest relative basal area.Furthermore,it also has the optimum horizontal and vertical structure and it can be applied in Chinese seacoast.