In order that the max released energy of the output short circuit is less for meeting the essential safety re-quirements in the Buck converter,this paper proposes that a interleaving technique is applied into the Buck converter,and takes two-interleaving Buck converter for example.In the same total output current,the interleaving Buck converter makes the total output current ripple and the output voltage ripple decrease.The branch current is half of two the total current,which can decrease the current stress of the switch tubes and diodes.The total frequence is 2 times bigger than the branch one,which can reduce the output filter capacitance.These are beneficial to the re-alization of essential safety.Through the comparison of the traditional Buck converter and the interleaving converter in Matlab,the result proves the correctness of the proposed method.