Abstract: In the process of solar energy development and utilization, Boost converter can achieve high voltage Boost ratio, but there is a problem of high voltage stress of switching devices. In order to reduce the switching device voltage stress a low stress high gain Boost converter basic structure is proposed,which reduces the voltage stress while increasing the voltage gain. In order to better apply to a variety of boosting situations,four types of boosting units,namely secondary Boost network,switched inductor network,switched inductor-capacitor network and quasi-Z source network,are replaced with their energy storage inductors to obtain a class of low-stress high-gain Boost converter. The operating characteristics of the high-gain Boost converter replaced by using quasi-Z source network are analyzed and compared with the same type of converter. Finally,the correctness and feasibility of the theoretical analysis of the proposed converter are verified by using Matlab/Simulink simulation software and experimental prototypes.