Objective　To explore the clinical superiority of two kinds of chopping nucleus methods in phacoemulsification——etch and turn technique, stop and chop technique.Methods　Three hundred and sixty-five eyes were performed with phacoemulsification, among which 85 eyes were performed with turn technique and 280 eyes were performed with chop technique.The results of the two kinds of chopping nucleus were analyzed.Results　(1)Time of chopping nucleus:time of turn technique averaged 81.26 seconds while chop technique averaged 40.71 seconds; (2)Visual acuity in the first week after operation:turn technique:vision of 76 of 85 eyes were 0.5 of better, 7 eyes were 0.2～0.5(8.2%) and 2 eyes were 0.2 or worse; chop technique: vision of 253 of 280 eyes were 0.5 or better (90.4%), 21 eyes were 0.2～0.5(7.5%) and 6 eyes were 0.2 or worse (2.1%);(3)Reaction of corneal endothelial cells after the operation: central endothelium rugosity appeared in 4 eyes (4.7%) with turn techinque and in 7 eyes (2.5%) with chop technique. Conclusion　The operation of the former is less difficult and the chopping nucleus time is longer. The time of the operation on the latter is shorter and it is appriate for hard nucleus and should be applied and spreaded. There are no marked differences as for the vision after the operation and the microcorneal injury between them.