Abstract: In order to overcome the many shortcomings of the traditional conversion system, this paper proposes a new kind of continued heat transfer conversion system.The new system is in accordance with the advances of contemporary chemical engineering because it makes the equipment smaller. In addition, an optimal research on this new system is made and the optimal results under the three kinds of different objective function are obtained. Three kinds of different objective functions are minimum catalyst amount( R ₁), minimum total equipment investment ( R ₂),minimum total equipment investment and operation expense per year ( R ₃).