Precision casting, lost wax casting, is our country at present the most widely used, precision casting one of the most delicate, export most of foundry technology, is very important in our country export trade a goods, than the surrounding countries, southeast Asia, whether in construction technology, material costs have very big advantage, is a price impact.Foreign firms in many countries came to China to carry out precision casting processing business, build the casting workshop, using China's cheap labor market, production of precision casting parts for their own needs, then back to their country.Countries are also in the study the trade deficit phenomenon, is this kind of situation.