Objective: To probe into essence of syndrome types of blood stasis syndrome. Methods: High shearing whole blood viscosity （ηHB）. low shearing whole blood viscosity （ηLB）

plasma viscosity （ηP）

aggregation index of erythrocyte （AI）

hematocrit （HCT） and levels of serum total cholesterol （CH）

triglyceride （TG）

plasma fibrinogen （Fb）

prostacyclin （PGI2）

thromboxane （TXA2） were determined in 216 cases of coronary heart disease with blood stasis syndrome. Results: ηLB and AI increased and PGI2/TXA2 ratio decreased significantly in the group of stagnation of Qi and stasis of blood

showing high aggregation state of blood: CH

HCT

Fb

AI and ηLB increased significantly in the group of blood stasis due to Yin -deficiency

showing high concentration

high agglutination and high aggregation state of blood : ηLB

ηP and TG increased significantly in the group of stagnation of phlegm and blood

showing high viscosity state of blood; only ηHB had some increase in the group of Qi - deficiency and blood stasis . Conclusion: Different syndrome types of blood stasis syndromehave different biochemical material base

and changes of blood physical and chemical properties are closely related with TCM syndrome types

which provides an experimental basis for treatment of subtypes of blood stasis syndrome.