Abstract:In this paper, the fabrication method of metal three dimensional lattice structure are classified, the characters of every method are discussed and compared. According as the characters of SPF/DB(Superplastic forming/Diffusion bonding) process, it is introduced into fabricating three dimensional lattice structure, the lattice sandwich structure is looked as three-layer or multi-layer hollow structure, three type lattice sandwich structures are fabricated, it is verified that the feasibility of SPF/DB process is validated, this new method will promote the development of metal three dimensional lattice structure.The characteristics and advantages of additive manufacturing method, plastic forming methods ,SPF/DB method are compared, it is convinced that the SPF/DB process is a suitable method to produced large size, complex shape of the sandwich structure, so in the future, lattice sandwich structure fabricated through SPF/DB process will has good prospects in hypersonic aircraft and its high thrust to weight ratio engine .