In the marine steam power plant, the main boiler has the small size and the little heat capacity. However, marine ship requires high maneuverability, when it is running, the loads varied frequently, and the varying range is big, and this will cause the boiler security problem, such as over-pressure or under-voltage. The marine steam power plant boilerturbine coordinated control strategy is to solve the contradiction between the mobility and safety, which is caused by the host load changes quickly and boiler energy supply changes slowly. The traditional boiler following turbine, turbine following boiler or DEB (Direct Energy Balance) can’t solve this problem. This paper introduces the multi-objective adjustment / protected thought and proposes boiler-turbine coordination switching based on switching. Based on this switching strategy, we analyze the stability of the system. Finally, we validate the correctness of the strategy by simulation calculation.