At present, the output current of the synchrotron power supply of heavy-ion medical accelerator is periodic trapezoidal wave, and there are repeated rising and falling segments of current in different periods, which makes the beam efficiency low. In order to improve the work efficiency and economic benefit of medical accelerator, three new energy change methods are proposed in this paper, namely waveform segmented trigger, orderly trigger and real-time setting, and the concrete implementation scheme of each method are presented, too. Finally, the test results are introduced.