High gain DC-DC converters are increasingly being used in solar PV and other renewable generation systems. Satisfactory steady-state and dynamic performance, along with higher efficiency, is a prerequisite for selecting a converter for these applications. This paper proposes a high gain DC-DC boost converter. First, the circuit topology and the working principle are discussed in detail. The circuit parameters are designed. Then, the proposed converter is compared with other similar recently proposed converters on various performance parameters. Finally, a system simulation model is established by Matlab software, and the experimental prototype is developed. The simulation and experimental results verify the correctness of the theoretical analysis. The proposed converter only uses one power switch, which has continuous input current and can reduce the voltage stress between switching devices. The working range of duty cycle is wider, and higher voltage gain can be obtained at lower duty cycle. Continuous input current is an ideal characteristic of a DC-DC converter. This makes it very suitable for solar photovoltaic applications. This work is supported by the National Natural Science Foundation of China (No. 61702182).