Abstract: AIM:To explore the correlation of microalbuminuria (MAU) and stent restenosis 1 year after percutaneous coronary intervention (PCI). METHODS: Serum microalbuminuria was tested in patients prior to PCI. One year after PCI, patients were divided into restenosis group and no-restenosis group by coronary artery angiography and the results were compared. RESULTS: Serum microalbuminuria levels (59±16) mg/L in restenosis group were significantly higher than in the no-restenosis group (39±15) mg/L (t=4.316, P<0.05). Serum MAU levels were, respectively, (40±3) mg/L in single-vessel lesions, (55±5) mg/L in two-vessel lesions, and (82±11) mg/L in three-vessel lesions (F value = 61.426, P<0.05). The difference was statistically significant. CONCLUSIONS: Microalbuminuria is a good predictive index for coronary artery stent restenosis 1 year after PCI.