In the nuclear fusion Tokamak machine, the Feeder system requires Feeder joints for connection. Due to the installation misalignment of these two Feeder sections, the Feeder joints have difficulty connecting the two sections of superconducting busbars, which transfer heated plasma. Under these conditions, the pre-manufactured Feeder joint shims are not suitable for Feeder joint assembly. All the shims must be re-machined according to the adjusted dimensions to correct the misalignment errors. On the other hand, the re-machined work has a significant effect on the on-site fusion Tokamak assembly work schedule, so the manufacture of Feeder joint shims needs to be well managed. This paper investigates the entire process of Feeder joint shim design and manufacture, proposes optimization measures in both the design and manufacturing stages, and analyzes the benefits and improvements after the optimization measures are implemented. It is found that with the help of advanced reverse engineering and improved design and manufacturing methods, the quality of Feeder joint shim can be guaranteed under the tight schedule of on-site Tokamak assembly work. The optimized shim design and manufacturing method also brings benefits in schedule and cost reduction.