OBJECTIVE：To investigate the e ffects of Zhuangtongyin water extract （ZTYWE）on hemorheology and blood lipid level of myocardial ischemia-reperfusion model rats ，and preliminarily explore its molecular biology foundation of reducing arrhythmia after myocardial ischemia-reperfusion. METHODS ：Totally 75 SD rats were divided into control group ，model group and ZTYWE low-dose ，middle-dose and high-dose groups. Myocardial ischemia-reperfusion model was established by ligating the left ventricle cyclotron endings for 30 min then reperfusing for 60 min. Since the first day after surgery ，control group and model group were intraperitoneally administrated with same volume normal saline ；ZTYWE low-dose ，middle-dose and high-dose groups were intraperitoneally administrated with medicine solution （6.8，13.6，27.2 g/kg），once a day ，for continuous 28 d. At the 7th， 14th，21st，28th day after surgery ，the incidence rate of arrhythmia of rats were detected. The hemorheology indicators and serum contents of TC ，TG，LDL-C，HDL-C were determined after the last administration. The morphology of myocardial tissue was observed by HE staining. The protein expressions of apoptosis-related factor FAS and FAS-L were detected by Western blotting assay. RESULTS ：Compared with control group ，the incidence rates of arrhythmia of rats in model group were significantly increased；the whole blood contrast viscosity ，hematocrit（HCT），in vitro forming length and quality of thrombosis ，platelet aggregation rate ，erythrocyte filtration index （IF），as well as the serum contents of TC ，TG and LDL-C were significantly increased；in vivo thrombus formation time as well as the serum content of HDL-C were significantly decreased ；the protein expression of FAS and FAS-L were significantly increased （P＜0.05 or P＜0.01）；obvious pathological changes were observed in myocardial tissue. Compared with model group ， the incidence rates of arrhythmia of rats in ZTYWE groups were in obvious reducing trend ； except for the HCT in 163.com low-dose ZTYWE group without significance ， the blood contrast viscosity ，HCT，in vitro forming length and quality of thrombosis ，platelet aggregation rate ，IF as well as the serum contents of TC ，TG and LDL-C were significantly decreased ；in vivo thrombus formation time as well as the serum contents of HDL-C were significantly increased ；the protein expressions of FAS and FAS-L were significantly decreased （P＜0.05 or P＜ 0.01）；the pathological changes of myocardial tissue were improved. CONCLUSIONS ：Through the promoting blood circulation and removing blood stasis effect ，Zhuangtongyin decoction can improve indexes of hemorheology index of ischemia-reperfusion model rats ，reduce the contents of TC ，TG and LDL-C ，enhace the contents of HDL-C ，down-regulate the protein expression of FAS and FAS-L ，so as to inhibit myocardial cells apoptosis and reduce arrhythmia.