The Surface Multiphase Single Lobe PCP is a positive displacement pump whose main parts are stator and rotor that adopted the technolog of multi head involute type curve. The main advantages are wide range rotating speed, small pressure pulsation, stable rotation, high sucking performance, simple structure, reliability, long working life etc.. It is suitable for various liquid medium like high viscous oil and multiphase transportation which can be widely used in petroleum, coal, chemicals, food area. Now four series and 11 kinds of products had been developed.