Spartina green food ecological engineering can produce various ecological and economic benefits. Not only can the biomineral liquid with a number of health functions (cardiotonic, antiinflammation, enhance of immunity, lengthening of life span) be extracted from Spartina culms, but also, the total flavonoids of Spartina can be separated, which can significantly esist blood coagulation and encephalon thrombus. The grass residue can be used to culture mushrooms. The practice showed that economic benefits from this engineering are huge. During 1991-1995, the new output values were about 112 million yuan RMB and the new profits were up to 30 million yuan RMB. We plan to develop fourth level benefit from the mushroom culture residue and to exploit more benefits from the engineering.