Abstract: The application of gel polymer electrolyte (GPE) provides a promising scheme for improving the safety of lithium-sulfur batteries and inhibiting the shuttle effect. The GPE can improve the charge transfer obstruction and uneven lithium deposition caused by the high interface impedance between the all-solid electrolyte and the double electrode, and effectively solve the defects such as fast capacity decay and poor cycle stability. In this paper, two different technological means, in-situ polymerization and non-in-situ polymerization, are introduced for the preparation of GPE in lithium-sulfur batteries. The methods of improving the GPE base by different synthetic processes are described, and the "benefits" brought by different processes are analyzed, and the application of real-time and accurate in-situ characterization instruments in lithium-sulfur batteries is introduced. It is pointed out that in situ advanced characterization technology can guide the electrode material design of lithium-sulfur battery and provide researchers with more suitable synthesis technology of GPE for industrialization.