This article is on the study of the correlation between Total Flavonoids of Spartina alterniflora (TFS)and four environmental factors:organic matters,total nitrogen,soil salinity and seawater salininty The research results is that TFS has a highly correlation with soil salinity,and normal correlativity with organic matters and total nitrogen TFS accumulation is one of the tolerance reaction of Spartina alterniflora to the salt in the environment