Abstract: As a new type of research reactor with new fuel element and core structure, no experience can be used for the design and implementation of the power regulating system. Under same fixed power, steps disturbance and slope disturbance of reaction were leaded into semi object-based modeling and simulating, and count in the influence of rod operating area, the characteristic of the power regulation system is studied by using the PID control project. The reaults show that the same set of controller parameter can’t satisfy for the preconcerted control request. Under the fixed power, the different controller parameter at the different rod positions can satisfied for the preconcerted control index and control performance.