Abstract: This paper introduces the design and practice of LNG module tertiary structure in arctic region, according to one arctic region LNG project, and describes the tertiary structure design characteristics of this project through comparison, the tertiary structure design flow and consideration factors are analyzed. With the Russian rules and SACS software, taking a access platform as an example, using the limit state design method to check, the strength check and results under different working conditions are analyzed. Suggestions are given for design and construction stages in similar projects.