Three native clays were investigated as emulsifiers for kerosene in water system.The stability of emulsions obtained is considerably effected by the pH value of clay suspension. For every clay studied there is a specific pH value beyond which the emulsions obtained are unstable. For Nanking yellow drab soil the specific value is 5.3,Chuwen red soil 7.0, and Chu-san-den clay 5.0.