In order to ensure the safe and efficient construction, it is necessary to manage and limit the operation power of the dredging equipment. The traditional power limit adopts twostage or multistage limit, which achieves the goal of safe construction but has the limitation of low efficiency and great fluctuation of the load of main engine. A new control strategy is proposed based on the traditional way of restriction, which can manage the main load power dynamically when the whole ship's installed power is fixed,make full use of the whole ship's power efficiently,and improve the safety and efficiency of the ships in construction. The control strategy is applied to the actual ship of "HX021" and the test results are good.