The pipe flow and reservoir fluid form a coupled system. Therefore,a mathematical model is proposed,which is capable of solving pipeline flow system and reservoir fluidity system. In pipeline system,Drift-flux model has been used to elucidate multiphases flow process with consideration of the influence of viscosity increasing of polymer solution. And Darcy laws have been used to describe reservoir fluidity system. On the basis of that,the decoupled solution has been given, the decoupled calculation has been...