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Due to the using of an uncontrollable AC/DC rectifier in traditional hybrid rubber tyre gantry crane, there is a problem that the diesel generator might go into idling because of the DC bus voltage pumping , which leads to the waste of energy. Replacing the uncontrolled diode rectifier with a controllable active front end converter, a power outer loop control method and a voltage outer loop control method of the AFE converter are proposed to realize the efficient use of diesel generator. A matlab/simulink simulation model is built and simulations are carried out under the condition of heavy load, light load and no load. Simulation results show that the two control methods can both achieve constant power output of the diesel generator and the control system has a good dynamic performance.