Results: The mean rate of PCO is 38.72% (almost at level 1 accounting for 31.95%, level 2 accounting for 6.77%), fibrosis-type occurred at first from 1 month after surgery, pearl-type and mixed-type occurred later (12 months after surgery); the factors of previous history of diabetes and complications happen during, on and after surgery will increase the risk of PCO. These is no difference in PCO rate between two groups of different IOL implantation after 6 months (P = 0.352) Conclusion: PCO is a common complication of cataract surgery which is related to multi-factors