In order to meet the higher requirement of reusable rocket in the future, a light, high-pressure resistance and reusable astronautic composite vessels was designed. The pressure vessel used metal inner liner/composite layer structure form.The composite layer is made of T700 carbon fiber and resin, and the material of liner is aluminum alloy.Based on the finite element simulation and experiment, the strength and fatigue life of the pressure vessels were verified.The blasting strength of the composite pressure vessels, in simulation and experiment, is 81 MPa and 84 MPa respectively. The cyclic fatigue life is over 1 200 times. Under the working pressure of 23 MPa, the pressure vessels could meet requirements for 300 cycles.