You can develop molds at a lower price than other forming methods in a short time. It is the most suitable method for thinking in many different kinds and small quantities because it is easy to make partial design changes. The effects of vacuum molding and pressure hole forming are not known enough lately. Even in the a ctual utilizing area, many molds cost a lot to invest and get a small output. Therefore, we would like to introduce the basic concepts of vacuum molding, pressure hole forming.