During the emergency deceleration or reversing operation of the marine steam power system, the boiler drum is prone to overpressure, which endangers the safe operation of the power system. The steam return technology is an effective control method to relieve the overpressure of the boiler drum. Establish a steam power system simulation model including supercharged boilers, main steam turbines and propellers, and conduct simulation research on the dynamic characteristics of the power system. The simulation results show that in the process of load reduction, the use of return steam control can effectively avoid the overpressure of the boiler drum, and the working condition stabilization time is shortened by about 3 minutes; in the process of forward and reverse conversion, the use of return steam control drum shortens the time of forward and reverse conversion. The time is about 1min.