The composition of microemulsion processing and lubricating fluid for aluminum alloy was studied,and the influence of surfactant,cosurfactant on the emulsion stability,and the influence of lubricant additives on the lubricating properties of microemulsion were investigated.Tests were conducted on the developed microemulsion processing and lubricating fluid by using fourball machine and Timken test machine.The result shows that the microemulsion has better lubricating properties.Corrosion tests show that the developed microemulsion has no corrosion to aluminum and aluminum alloys,which meets the need of lubrication for aluminum alloys cutting.