Abstract: The numerical wave tank based on the potential theory simulates the wave progression and wave-structure interaction quickly, but it is based on the assumption of non-viscous. In reality, viscous effects are always considered at solid boundaries and wave-broken areas. For the viscous numerical wave basin based on solving the Navier-Stokes equation, however, it has the insufficient of large amount of calculation. Currently, the coupling method is used to simulate wave progression to reduce the amount of calculation and enhance the efficiency. In the outer domain, multidirectional irregular waves are generated from potential theory, and in the inner domain, the Navier-Stokes equation is solved in combination the VOF method to track the free surface.