[en] Xi'an pulsed reactor power regulation system is with regulation function of automatic and square-wave pattern control rod drive source is designed meet the operation characteristic of step motor, owing to the step motor first time utilized in the transmission parts of reactor Control Rod Drive Mechanism (CRDM). Results of trial run has proven: The maximum regulative departure value of nuclear power is less than 5 percent of full power, and the system dynamic respondent time is less than 10 seconds. This new system is characterized by rapid response, less overshoot, and high accuracy etc