In order to eliminate the phenomenon of trapped oil,a new type of chord rotor pump was proposed,which could transform sliding friction between tooth surfaces into rolling friction between tooth surfaces and rollers. The flow field of the chord rotor pump was analyzed by using the dynamic grid technology of FLUENT software and RNG k-ε model,the pressure and velocity distribution nephograms within the chord rotor pump at different times were obtained.The analysis results show that the chord rotor pump moves smoothly and can reduce noise to a certain extent, it meets the needs of production.