This article reviews both the experimental and theoretical works done on the effect of salts, including monovalent, divalent and trivalent salts, on the aqueous micellar solution of dioctanoyl phosphatidylcholine, a good model system of zwitterionic surfactants for investigation. The experimental methods and results on measuring the solution properties of the surfactant, such as the critical micelle concentration, the behaviors of micelle growth and phase separation, as functions of salt identity and concentration are described. The thermodynamic parameters of the micelle formation, the mechanism and theoretical model of the salt effects on the micellar solution of the surfactant are also introduced.