Abstract: In order to develop and use the agricultural resources and to protect reproduction,an ecological-ecolnomic system of breeding fish in a pond with reed fences and high level of pumped water has been built in the Dafeng Costal beach.It keeps the wetland ecosystem in the beach relative stability,continuity and biodiversity.With fresh water washing and breeding fish in the reed pond, it has speeded up improving guality of soil and fertiliter,forming good artificial and ecological economy,and sustainable devoloping of ecolgical agriculture in the costal beach.

Key words: intercropping system, maize, phosphorus,  , dry matter accumulation, yield, phosphorus use efficiency.