Abstract： In order to improve the current defect of super-pressure balloon gore design, a new approach to designing the superpressure balloon with a cablenet envelope structure was proposed. Different from the old approach, the load tapes sealed to the envelope was replaced by cables which could slid on the envelope to bear the longitudinal load. This approach combined the advantages of 2-D gore design with 3-D gore design. The controll of the initial configuration of the balloon was realized by changing the preload of the cables. According to the equal strength design criteria, the optimal initial configuration of the superpressure balloon was calculated with the ultimate strength of envelope and cable to improve the utilization efficiency of material. The influence of each parameter on the ultimate pressure of super-pressure balloon was discussed, providing reference for structure design and mechanical analysis of super-pressure balloon.