Abstract: High gain DC/DC converters have been widely used in photovoltaic, new energy, aerospace and other fields. In order to improve the reliability of Boost circuits in high gain applications, a new high gain Boost converter is proposed. The new converter added the switched capacitor unit and the coupling inductor lift unit on the traditional Boost circuit. The circuit can get the high output voltage with a reasonable duty cycle, and also reduce the voltage stress and the input current ripple of the switch tube, thus improving the efficiency of the converter. In this paper, the working principle and steady state characteristics of the circuit are analyzed in detail, and the control strategy of the circuit is given. On the basis of the theory, the experimental verification is carried out by using PSIM simulation software. The simulation results show that the new high gain Boost converter is theoretically correct and feasible.