Strictly following the process specifications and operating instructions during the production process is an important guarantee for improving the first-time qualification rate of precision castings At the same time, grasping the "details" of each operation is helpful for the success of process quality control Propose some improvement measures for process details, such as using mold heads with internal runners, exhaust mold heads, filter screen mold heads, bonding wax group trees, liquid wax to paste wax, one-time forming, and no wash release agents, etc., with the aim of improving casting quality and production efficiency, as well as perfecting and supplementing the investment casting process