Abstract: Based on the analysis of crack causes for underground storage cavern structure, the methods according to the space were to added on the second lining in underground storage cavern. The calculation methods for determining the space between the second lining was putting forward by controlling the crack not existing in the original concrete lining, and the load calculation formula of second lining was reduced by using the compatible displacement conditions of composite members, put forward a design method reinforced the underground storage cavern by adding second lining.