Through using the mullite as the main addition to the refractory,talcum powder,diatomaceous earth,mica powder for the auxiliary refractory aggregate,rectorite and attapulgite for the composite suspension agent and phenolic resin as well as white latex as a composite binder,an alcohol-based lost foam casting coating for aluminum alloy was prepared by orthogonal experiment and differential analysis.The results show that the coating prepared presents the satisfied strength and good permeability in the casting process with absence of fire,back spraying as well as the whole sintering,meanwhile,castings surface is clean without porosity and sand.