The increased level of fibrinogen (Fg) is an independent factor that resulting in the occurrence of ischemic cardio-cerebrovascular diseases. The Fg level is correlated with heredity, age, sex, obesity, lipid, smoke, inflammation and infection, and the pathogenic effect of genetic factor has been increasingly receiving attention. In recent years, more than 10 FgBβ gene polymorphisms have been reported, among them, - 148C/T, - 455G/A, and - 854G/A are considered to be significantly correlated with the increased level of Fg, and may be one of the most key factors in influencing the genetic risk factors of the occurrence of ischemic cerebrovascular disease.