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The single-phase Buck is often used in Power converters which have the function of MPPT, the stability of output power is poor. Because of that, this paper proposes interleaving technique is applied to the Buck converter, Take two-interleaving Buck converter for example, the output voltage and current ripple is reduced, the stability of output power is improved, and it benefits MPPT control. As fixed step size of perturbation and observation method cannot balance between speed and precision. Adaptive step algorithm is proposed. The simulation results show that this algorithm has better tracking speed and steady-state performance.