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The hydrodynamic forces and flow field of artificial model reefs in steady flow are investigated using the Computational Fluid Dynamics (CFD) code FLUENT.The RNG k ~ ε model is employed for turbulent closure of the Reynolds-averaged Navier-Stokes equations.Numerical experiments are performed for hydrodynamic forces with seven velocities,for flow field with one velocity.The computed forces and flow field are in good agreement with the experiments using flume tank tests.The differences values between measured and computed forces are gradually augmenting as the velocity of flow increasing,the errors of computed results relative to measured results are varying in range of 5.5 %~30.1%,and the relative errors are higher than the others when the velocity of flow is unstable.The flow field is changed greatly with the development of whirlpools and upwelling,while the flow passes through the model reef creates a complex effective ambient velocity.After the flow passing by the model reef,the velocity is not precisely depicted by experiment for the reason of whirlpools and upwelling.It illuminated that the numerical simulation method is applicable and can be applied to predict the hydrodynamic forces and flow field of actual artificial reef.