Vacuum modeling is a physical modeling method. It combines vacuum technology with sand mold casting. The cavity surface and back of the sand mold are sealed by plastic film, and negative pressure is generated by vacuum pumping to cause the inside and outside of the sand mold. The pressure difference causes the mold sand to be tightly formed. After placing the sand core, closing the mold, and casting, after waiting for the casting to solidify, the negative pressure is released or the air extraction is stopped, and the mold sand collapses to obtain the casting. According to the current application field, it can be divided into vacuum sealing model (V method) and solid vacuum casting (FV method).