Research results: In this paper , assembling centering structure of one extra-large stone arch bridge with 74 m height and 146 m span is introduced. Its superstructure is made切using military girder and the universal rods, and substructure is the timber arch cap. It is proved that the design for the steel-timber supporting frame is reasonable and applicable. The entire processes of building arch and removing arch accord with the design request, the engineering quality is pledged. This method can offer the readers important references of the all supporting frame for large type structures construction.