Objective To observe the effect of Huahongjiangxiantang on hemorheology and plasma fibrinogen (FIB).Methods 100 patients with hypertension were randomly divided into two groups:the treatment group ( n=50) which were treated with Huahongjiangxian-tang,and the control group( n=50)were treated with Aspirin.Hemorheology and plasma fibrin were detected before and after treatment for 8 weeks.Results After 8 weeks treatment,there were significant depressions in whole blood viscosity(low shear rate),RBC deformability index and RBC aggregation index( P<0.01 ),and better than the control group( P <0.05 ).There were significant changes in whole blood viscosity ( high shear rate),plasma viscosity,RBC rigidity index and plasma fibrin ( P < 0.05 ).A number of indicators declined significantly in control group ( P < 0.05 );The rate of platelet aggregation to improve the situation in the control group was better than that of the treatment group,but there was no statistical significance.Conclusion Huahongjiangxiantang can effectively reduce blood viscosity in patients with hypertension and improve the body's red blood cell function and fibrinolysis,benefit to the prevention and treatment of atherosclerosis and reduce the occurrence of thrombotic events. Key words: Hypertension; Huahongjiangxian decoction; Hemorheology