Abstract: With the background of the large-scale of modern satellite structure and propellant tank, a format of main satellite bobbin cylinder incorporated with main heary structure and bracket of large-volume tank, are proposed aiming at lowering the centroid and increase the fundamental frequency. The new structure type can meet the requirements of both the design of tank volume and the mechanical transferring efficiency from payload of main structure to carry. The numerical computation of finite element method indicates that the proposed structure format can meet the requirement of relevant structure performances and can server as the referential configuration of satellite structural design in the future. The main bobbin structure is weaved by high modulus carbon fiber, the cylinder of which is embedded a carbon fiber board inside. The designability and spreading weavablility should be made full use of to produce it according to the need.