Recently, with the development of semiconductor technology and power electronics technology, the need for high-voltage and high-power supply become more, especially in some scientific experiments. These experiments usually have some special demands such as high-voltage, high-power etc.The pulse step modulation (PSM) technology is the combination of the pulse width modulation(PWM) and the step modulation(SM).and it is an important technology which is used in high-voltage, high-power switching power supply system.Conditional power supply system based on PSM technology is made up of several power units and one of these units works at PWM while others works an on-off state. This strategy is easy to work but the unit working at PWM state has more switching loss and brings difficulty to the design of system. If we design every unit at PWM state, it is a great waste and if we design the units in two ways, it has difficulty in unification of standards.To solve the problems, we use a new control strategy. In this strategy the units work at PWM state in cycle. So the heat distributes to every unit. We can design every unit at the same size. MATLAB is also used to improve the control strategy. At last, the advantage of this new strategy is verified on an experimental prototype.

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