Aiming at resolving the nonlinear control problem of high-frequency switching power supply,a novel control approach for switching power supply is proposed based on the synergetic control theory in this paper.A new macro-variable for synergetic control is defined to reduces the current overshoot and shorten the dynamic response time of the system,and the synergetic control law of the system is derived.In order to improve the system robustness to disturbance of load resistor and input voltage,a compensation amount is added to the control law.The strategy of multi paralleled switching power supplies is adopted to fulfill the purpose of high-power.And a new method that combines most current automatic current sharing and synergetic control is proposed to achieve the output current sharing.The simulation results show that the methods proposed has better performance than other methods.