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Abstract：Numerical simulation of a three-dimensional turbulent flow in the whole flow field of an axial-flow fan is performed. Unstructured grids are used to discrete the computational domain. Pressure boundary conditions are specified to the inlet and the outlet. The SIMPLE algorithm, in conjunction with the RNG k-ε turbulent model, is used to solve the threedimensional Navier-Stokes equations. The moving reference frame is adopted to transfer data between the interfaces of the rotating field and the stationary field. Based on the calculation of the inner-flow in the fan, the velocity field and pressure field were farther analyzed. The simulation results are of important significance to the optimal design and noise control of the fan.