Abstract: In the hybrid renewable energy system,the use of multi-input DC/DC converter,compared with the traditional use of several single-input DC/DC converters,not only has the ability of simultaneous input of multiple circuits,but it also reduces the number of converters and the cost is lower. A multi-input high-gain DC/DC converter and its control scheme are proposed. The proposed topology has multi-input structure,and the circuit can still work normally when any one of the inputs is faulty. The proposed topology has high reliability,so it is suitable for various power applications. At the same time,in order to solve the problem of insufficient boost capacity of the basic DC/DC converter,the converter is optimized to achieve high gain. The topology of the converter is briefly described,and the working principle and performance characteristics of the dual-input converter are analyzed in detail. Finally,the correctness of the theoretical analysis is verified by simulation.