Objective: To investigate the effects of Danshen Chuanxinlian Decoction(DCD) on the hemorheological parameters of the rat model with high blood viscosity. Method: Fifty rats were divided into 5 groups: control group

model group and experimental groups. After 7 days of medication

a model with high blood viscosity by injecting NE and iced bath

and observed the effects of these two herbs on hemocheological parameters. Result: Blood viscosity and the content of plasma fibrinogen were decreased in DCD group compared with those in model group

and the combination of Danshen and Chuanxinlian could inhibit platelet aggregation and prolong prothrombin time. Conclusion: The combination of Danshen and Chuanxinlian can obviously improve the hemorheological parameters in rats with high blood viscosity.