Compound emulsifier is a kind of substance used to improve the surface tension between various constituent phases in emulsion and form uniform dispersion or emulsion. It plays a role in stabilizing the physical state of food, improving the organizational structure, improving the taste and flavor, and prolonging the shelf life in food processing. Compound emulsifier is usually composed of many ingredients, which is used to adjust the properties and characteristics of food. Margarine is a plastic oil product, which is usually made of vegetable oil, part of animal oil, water and seasoning through blending and processing. Its purpose is to simulate the texture and taste of cream, but its composition and preparation method are different from those of natural cream.