Abstract: Study on the critical paths for the schedule control of nuclear power projects has been performed for reactor M310,based on the experiences from Daya Bay project and Ling Ao project.The study shows that the critical paths for the nuclear power project are from NI civil work,NI erection,commissioning of single systems directly serving the CFT to the joint-test.For NI civil work,the critical path is the main civil work of the reactor building,pre-stressing,handover of room s for important areas,and key CW-erection interfaces;there are four critical paths for NI erection;For startup,two stages can be identified: commissioning of 16 single systems directly serving the CFT and joint-test.