Abstract: The loading capacity of filament-wound composite materials pressure vessels with pseudo-elastic inner alloy lining depends on the pseudo-elasticity of the inner lining. The optimum loading capacity of vessels can be obtained by designing the pseudo-elasticity range of the alloy reasonably. Based on the phase transformation theory of the pseudo-elasticity alloy and mechanics of the composite materials with combination of the strength theory，the analytical method of strength and the enhancement conditions of the load-bearing capability of the composite materials pressure vessels with pseudo-elastic inner alloy lining were suggested. The research results show that the pseudo-elastic inner alloy lining can improve the stress state，change the inner lining master into the shell master，and make full use of the functions of the composite materials. Meanwhile，it can ensure that the inner lining works in the linear elastic range，and the pressed buckling phenomenon cannot happen when unloading. So the composite materials pressure vessels with pseudo-elastic inner alloy lining can increase the limit loading capacity and lengthen the work life of the inner lining.