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A new method for nearshore wave simulating is introduced. Firstly, parabolic mild-slope equations are set up according to the simulation area and input waves. After solving the equations, the integral wave parameters such as the root mean square wave height, the peak wave period and the mean wave direction can be calculated. Instantaneous surface elevations can also be obtained from the model. Then, the integral wave parameters and an instantaneous surface elevation are composed into a float texture. Finally, a viewpoint-dependent sea surface is rendered using this texture as wave parameters. Experimental results show that this method can be applied to simulate large area nearshore wave in real-time with realistic effect. It is suitable for the application of real-time simulation, particularly for marine simulator.