After laser surface treatment of TiAl alloy, superplastic forming/diffusion bonding (SPF/DB) was carried out. The structure transformation of laser surface melted TiAl internietallic alloy and its rule of SPF/DB were discussed. The results show that, during the annealing treatment, the dendritic structure formed by laser surface melting will be transformed into fine-grained structure, which offers a good structural basis to SPF/DB. And the SPF/DB results show that the main bonding parameters influence on bonding effect commonly, thereinto, the choice of fitting temperature plays a key role.