Twin screw pump, with strong CIP function, it could be transported solid particles, gas-liquid mixture, media with high or low viscosity and so on. It not only could be used to extract and convey madia, but also could be used in CIP and SIP system. It could reduce pipeline, valve and CIP pump, which improve effiency and reduce cost. Such pump also is equipped with the extra advantage such as: no pulse, no particle damage, high pressure, wide speed range, large flow range and so on.