Pump is a very wide range of machinery applications, it plays an important role in various sectors of the industrial production. This paper based on Computational Fluid Dynamics (referred to as CFD) theory, using commercial CFD software Fluent to study the pump flow field distribution. Compared with traditional methods, reducing complexity. Summarizes the different discharge operating conditions, pump velocity and pressure field distribution, and made a performance test. For the pump efficiency and performance improvement to provide a theoretical basis.