Abstract: Compared with the rushing with nuclear steam, the turbo-generator rushing with non-nuclear steam can be used to verify the design, manufacture and installation quality of the turbo-generator, and shortens the timescale of the system commissioning of the nuclear power plant to create huge economic benefits. By establishing the thermal equilibrium calculation equation based on the first law of thermodynamics, this paper calculates the time of turbo-generator holding at 1500rpm, the consumed energy of the rushing, the replenishment of loop 1 and loop 2.The theoretical calculation is further checked according to the actual process of Unit 1 in Fuqing No.1 non-nuclear steam rushing. It is proved that the theoretical calculation method agrees well with the actual process of the system. In the process of non-nuclear rushing of Unit 3 in Fuqing Nuclear Power Plant, the non-nuclear rushing step is optimized to reduce the fluctuation of the key parameters of loop 1 and loop 2 during the rushing process for reducing the risk of unit control and extend the non-nuclear rushing time for further verifying the quality of the steam turbine . After the non-nuclear rushing of Unit 3 in Fuqing Nuclear Power Plant, the optimization measures were proved to be effective by comparing the non-nuclear rushing parameters between Unit 1 and Unit 3.