Sodium dodecyl sulfate with good characters like emulsification, foaming, water-soluble, biodegradable, alkali resistance, resistance to hard water, and stability in the wider pH value of solution, and easy to synthesis, low price, etc. has been widely used in cosmetics, detergent, textile, papermaking, lubrication and pharmaceutical, building materials, chemical industry, oil and other industries,  It can also be applied to the basic research of the properties of the complex system of positive and negative ionic surfactants, micelle catalysis, molecular ordered combination and so on.