Abstract: As a new type of research reactor, no experience can be used for the design and implementation of the power regulating system. So it is necessary to determine the algorithm, parameters and its dynamic characteristics through modeling and simulating for reactor power regulating system. Modeling and simulating system is a simulated close-loop control system. The power regulating system implements arithmetic of power regulating on the basis of difference between current and given power, then outputs stepping motor controlling signal in order to regulate power. Different control methods with close-loop control system were experimented on the modeling and simulating system. The results indicate that the given control target and control performance are fulfilled preferably by different rod position adopting different controller parameters. The study and its results would provide theoretical and methodological basis for the design and implementation of the power regulating system of the new type nuclear reactor.