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Seaweed is a kind of inferior phototrophy plant living in ocean as well as one of the original producers of ocean organic substance. Owing to special environment medium ocean seaweed lives in, besides nutrients owned by land plants, seaweed also contains a large variety of microelements such like iodine, kalium, magnesium, manganese, titanium and so on overriding many land plants as well as algal polysaccharides and mannitol. The unique constitution---algal polysaccharides can not only chelate heavy metal ion, but also enhance air permeation of soil, warding off soil corrosion by wind, water and so on. In addition, seaweed contains various vitamin and nitrogen-contained compound etc.