A three-dimensional numerical tsunami model is developed to analyze the nonlinear behavior of flow around obstacles with the Marker and Cell (MAC) method based on the Navier-Stokes equations. Through a comparison with experimental data for the cases of dam break and solitary wave propagation, verification of the three-dimensional numerical model is given. Numerical experiment is performed for the analysis of the nonlinear behavior of flow around obstacles and compared with experimental data. The velocity and pressure around obstacles are presented with sufficient accuracy for tsunami propagation passing through an obstacle. A three-dimensional numerical tsunami model is developed to analyze the nonlinear behavior of flow around obstacles with the Marker and Cell (MAC) method based on the Navier-Stokes equations. Through a comparison with experimental data for the cases of dam break and solitary wave propagation, verification of the three-dimensional numerical model is given. the velocity of the pressure around obstacles are presented with sufficient accuracy for tsunami propagation passing through an obstacle