Biosurfactants are a kind of biomolecules which have the basic structure and charactersistics of surfactarts and produced by microbial fermentation processes and enzymatic synthesis. Because of their unique properties of great bio-compatibility, low toxicity, high biodegradability and stable activity at extremes of pH, salinity and temperature, biosurfactants have been widely applied to food, pharmaceutical, cosmetic, and cleaning industries. Therefore, it is very important to raise yields and reduce production costs for the applications on large scale.