A, blow hole, shrinkage cavityStomatal problem in the process of low pressure casting is the most common, it is usually due to the mold of the instruments of the venting is not good, bad mold spray coating system, cooling ring Settings, can also lead to porosity, shrinkage cavity.Second, the crackCrack of low pressure casting process, it is very common, the mould design is unreasonable, sharp corners, differences in the wall to its thickness and the crack phenomenon of metropolitan result from, want to eradicate the crack phenomenon, improve the mold structure design is the inevitable choice, only the mould design is reasonable, for the solution of the problem to help.The processing technology of low pressure casting technology in our country use is widespread, with the development of technology, the disadvantages are increasingly apparent, we only analyze the root causes of problems, can better solve the problem.