Choose the principle of antifoaming agent type depends on the composition of lube oil and oil use, use of additives in lubricating oil for surface active agent, a surfactant can and several kinds of effect, so should be considered in terms of lower and inhibition of lubricating oil to generate foam oil formula used in other types of functional additives. Mechanism of the interaction between the surfactants in oil is complicated, many occasions and can't rely on theoretical reasoning to solve problems, to make the play a good effect of the application of antifoaming agent, lubricating oil must be actual test of oil system in many aspects, and studies and USES the multiple effect additives is the key to improve the economic benefit and improve the quality of product. Because, the use of multi-effect additives can meet the use of oil function on the premise of reducing the number of functional additives, which can reduce the complexity of lubricating oil which contains a variety of surface active substances system, reduce the impact of uncertain factors on the stability of oil, oil stability is the key to determine its quality.