Abstract: Objective To investigate the effects and the safety of rosuvastiatin in actute coronary syndrome (ACS)complicated with hyperlipidemia.Methods Ninety patients with hyperlipidernia were randomly assigned into simvastatin group (n=42) and rosuvastatin group(n=48).They were treated with simvasmtin and rosuvastatin respeetively 10 mg/d and 10 mg/d for 1 week.Lipid profile and physical laboratory investigations for adverse effects were also assessed.Serum levels of total cholesterol (TC),triglyceride (TG),low density lipoprotein cholesterol (LDL-C),high density lipoprotein cholesterol(HDL-C)and Lp(a)were measured at the end of 1 weeks of the trial period. Results Rosuvastatin treatment was more effective than simvastatin in reducing serunl levels of TC,LDL-C and Lp(a)and in raising HDL-C.The difference of liver and kidney function of 2 groups was not statistically significant.The abilities of atorvastatin treatment group in decreasing inflammatory markers in TNF-a and CRP levels were stronger than those in the simvastatin group.Conclusion Rosuvastatin has full-scale lipid-regulating effects,especially in reducing serum levels of TC,LDL-C and Lp(a) and in raising HDL-C.