Abstract: The by-pass technique of cement kiln was introduced briefly in this paper. According to the characteristics of the by-pass residual heat resources of cement kiln, a new method was proposed which was used in the residual heat through the SP boiler .One hand,by this technology,it could solve the problem of high sulfur, alkali and chlorine in raw materials and cement fuel .The other hand,fully using residual heat resources could generate more power and reduce the cost of cement.