To improve the sense of reality for the nuclear power station simulation training system， a 3-D dynamic simulation system based on virtual reality technology is designed. The main powerhouses and equipments of nuclear power plants are modeled by means of 3-D modeling technology. Roaming in nuclear power station virtual scene is realized by 3-D interaction technology. Equipments dismounting， cooling system and working principles of the reactor core are simulated using 3-D animation technology. A sequence animation generating method based on parameter-correlation is proposed to realize virtual equipments dismounting. The effectiveness of running water in the cooling system is simulated by means of the texture method. A model-superposition method is proposed to simulate the reaction rate within the reactor. Through this system， trainees can grasp the structure and working principles of the nuclear power station in a visual mode， thus improving the training effects.