Abstract: Cainan-Shixi pipeline, when operating with full-filled oil, the oil treating performance of the PPD was remarkable. When the flow rate was lower, the pipeline section after the control point can not be fulfilled, the gel points tested in Cainan inlet were dramatically increased and then the effect of the PPD was seriously affected. The paper proposes two solutions and considers that one of them-alternate full-filled flow transportation may solve the problem.