Abstract: A certain support plate assembly belongs to the prefabricated structure, the profile is a complex curved surface, the installation edge position is machined and formed, thus there are many strict size and technical requirements. In this paper, taking the assembly as the object, the processing technology of the assembled assembly is studied. The whole process of assembly is improved by adding heat calibration to the 3D printed blank to control the deformation, reserving the process step to provide the accurate positioning reference, designing the fitting fixture to control the deformation, optimizing the milling path trajectory, processing parameters and improving the cutting efficiency of the superalloy material. It provides reference value for the machining of complex structural parts.