Traditional foundry technologies for Mg alloy were surv eyed. The merits and deficiency of Mg alloy in lost foam casting were analyzed o bjectively. A new lost foam casting under controllable atmosphere and pressure f or moltem Mg alloy forming was presented. The technology very suitable for Mg al loy in precision casting possessed superiorities of lower investments and cost

higher quality and accuracy

higher productivity. In addition

the difficulties susceptible to oxidation and flaming during liquid Mg alloy forming can be effe ctive overcome.