Objective To assess the effects of fluvastatin retard tablets on the elder patients of acute coronary syndrome(ACS) complicated with diabetes mellitus(DM) undergoing percutaneous coronary intervention (PCI) and the safety of drugs.Methods From December 2009 to December 2011,78 elderly patients (age≥65 years) of ACS complicated with DM who underwent PCI were enrolled in this study.They were all treated by drug elution stents.They were divided into group A(fluvastatin retard tablets 80 mg/d) and group B (fluvastatin retard tablets 160 mg/d) with 39 cases each by random digits table method.The plasma levels of high sensitivity C reactive protein (hs-CRP),matrix metalloproteinase proteinase 9 (MMP-9),monocyte chemoattractant protein 1 (MCP-1) and lipid levels were measured before and after treatment of 24 h,7 d and 180 d.All the patients were followed up for 180 d,and the adverse reaction of drug and the incidence of cardiovascular event were detected.Results Blood lipid levels had no significant changes in the two groups before and after treatment (P ＞ 0.05).The plasma levels of hs-CRP,MCP-1,MMP-9 were higher after treatment of 24 h than those before treatment in two groups [group A:(12.14 ± 2.71)mg/L vs.(8.76 ±2.25) mg/L,(491.75 ± 19.29) ng/L vs.(440.56 ± 13.15) ng/L,(449.6 ±11.8) μmol/L vs.(353.8 ± 16.0) μ mol/L;group B:(11.39 ± 2.38) mg/L vs.(9.30 ± 1.99) mg/L,(488.56 ± 17.61) ng/L vs.(436.06 ± 15.36) ng/L,(444.9 ± 19.1) μ mol/L vs.(349.8 ± 13.6) μmol/L],and there were significant differences (P ＜ 0.05).The plasma levels of hs-CRP,MCP-1,MMP-9 decreased significantly after treatment of 7,180 d compared with that after treatment of 24 h in two groups (P ＜ 0.05).Compared with those in group A,the plasma levels of hs-CRP,MCP-1,MMP-9 decreased even lower in group B[after 7 d:(4.51 ±1.16) mg/L vs.(5.43 ± 1.44) mg/L,(306.06 ± 18.49) ng/L vs.(384.64 ± 13.23) ng/L,(206.2 ± 16.8)μ mol/L vs.(263.4 ± 15.4)μ mol/L;after 180 d:(4.23 ± 1.08) mg/L vs.(4.68 ± 1.46) mg/L,(280.16 ± 14.54) ng/L vs.(354.64 ± 11.32) ng/L,(187.2 ± 14.2)μ mol/L vs.(225.4 ± 12.7) μ mol/L],and there were significant differences (P ＜ 0.05).After followed up for 180 d,there was no serious adverse reaction in two groups,and the total incidence of cardiovascular event in group B was lower than that in group A [7.7％(3/39) vs.25.6％ (10/39)],and there was significant difference (P ＜ 0.05).Conclusion Intensive lipid lowering therapy can reduce the level of inflammatory factors and cardiovascular event of the elder patients of ACS complicated with DM undergoing PCI and has good security.