Developing status of small-middle typical enterprises from lost foam casting,such as Citation Foam,Irish Foundry and Mueller in the U.S.A was described,focusing on multi-functional support bracket,variance-speed housing from Citation Foam and aluminum alloy pin,cast aluminum sprayed nozzle from Irish Foundry to exhibit the advantages of lost foam casting.The process of producing valve body at the Muller was introduced in detail from selection of foamed materials and coating and raw sand,set of processing parameters,design and optimization of gating system and pouring temperature.