Objective To assess the therapeutic effect and safety of Chinese medicine with the actions of activating blood and removing stasis in the treatment of acute coronary syndrome(ACS)patients.Methods Sixty-six patients with ACS were randomly assigned to the control group,the Danshen Injection(DI) group and the DI combined with Chuanxiongzine Injection(CI) group.All of the three groups received antithrombotic therapy besides the corresponding medicine according to the experimental design.The therapeutic effect and safety of the three groups were observed and compared after treatment.Results The hemorheology of ACS patients in the three groups was improved(P