Resin injection molding is a closed mold forming process between hand paste, spray and mechanical molding. It adopts simple or complex resin molds with good heat preservation performance to complete the injection moulding. Resin molding is very similar to cold pressing in terms of no heating and low-pressure forming, but it is essentially different in terms of material supply mode, product types and forming cycle that can be formed at the same time in the same process. The molding cycle and certain productivity will not be affected if several types of mold are used for continuous injection. Resin molding process provides the rapid prototyping method to produce specific injection molded resin parts, it becomes moldable when beyond certain temperature and harden when cool back, create last resin molding parts with the precise specification, molding resin components greatly saving time and production costs.