Computer graphic technic has been widely applied to make the visual image of numerical simulation result. In the computer graphics, the view point is generally fixed on the one point with a large height. The virtual reality system with five large screens has been developed in order to make the audience have the presence. In the system, the view point is able to be moved to any point during calcuation. This system has been already applied to make the virtual image of the tsunami attack to a harbour.
　In the present paper, the virtual graphics of wind wave transformation in a harbour is developed. The Boussinesq equation model which can caluculate wave diffraction, refraction and nonlinearity is applied for the numerical simulation of wave profiles in the harbour. The virtual reality system for wind wave calculation is applicable to the design of breakwater arrangement considering the view from navigators and fishermen.