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To avoid the impact of marine environmental loads such as wind, wave and current, mud line low temperature on drilling and completion operation string and production string, offshore pipe-in-pipe structure was widely used for its good safety protection, thermal insulation, transmission and other properties. At present, the mechanics, strength and safety analysis of pipe-in-pipe(PIP) were mainly based on single pipe structure. In order to systematically sort out the mechanical analysis method of PIP during operation, firstly, the structural composition of PIP, the internal pressure, external pressure and buckling design and verification analysis methods of offshore single pipe were introduced. Then, according to the characteristics of horizontal collapse of offshore pipe string, the main four collapse modes and the calculation method of collapse transmission pressure of PIP were explained based on the single pipe collapse and its propagation formula. Finally, on the basis of summarizing the theory and results of PIP dynamic analysis, the development direction of PIP structural dynamics was put forward. The study is helpful to the in-depth study of structural mechanics of offshore PIP, and can provide reference for the safe operation of PIP in deep water in China. [ABSTRACT FROM AUTHOR]