Abstract: 【 Objective 】 In order to explore the effects of different stiffening forms on the bearing capacity and anti-blast performance of double stiffened cylindrical shells, the response of four kinds of double stiffened cylindrical shells under hydrostatic pressure and underwater explosion load was studied numerically. 【 Methods 】 Firstly, finite element models of stiffened cylindrical shells with different structural forms were established. Secondly, the finite element software ANSYS is used to calculate and analyze the influence of the structure form on the strength, stability and ultimate bearing capacity of the cylindrical shell. Finally, finite element software Abaqus/Explicit is used to calculate and analyze the influence of the structural form of the cylindrical shell on the deformation deflection and plastic strain of the cylindrical shell under explosion load. 【 Results 】 Compared with the traditional single-stiffened cylindrical shell with the same mass, the I-shaped double-stiffened cylindrical shell has a great advantage in carrying capacity. When the explosion load level is low, the antiknock performance of the double-layer cylindrical shell with small frame spacing is similar, but it decreases when the explosion load level is high. 【 Conclusions 】 Reasonable design of double-stiffened cylindrical shell can obtain a better design scheme of bearing capacity and anti-knock performance.