The present invention provides a composition including at least six of the following traditional Chinese medicines: Ren Shen, Dang Gui, Huang Qi, Gan Cao, Chai Hu, Huang Lian, Tian Zhu Huang, Huang Qin. The composition possesses pharmaceutical activities of inhibiting platelet aggregation and prolonging bleeding time, and can be used in preventing and treating a cerebrovascular disease.