针对二维波动方程，我们研究了一个实例，即弹性薄膜的波动方程。 其实际物理意义是：两手抓住弹性薄膜的两个位置，分别提起，使薄膜上形成两个峰，在t=0时刻突然松手，根据生活常识可以预料，这两个位置的薄膜将来回震动，与此同时产生的波向四周传播，而且波与波会在相遇处叠加。用matlab编程并将这个过程可视化。(In view of the two-dimensional wave equation, we have studied an example, the wave equation of the elastic film. Its physical meaning is: grasping the two position, the elastic film were filed to form the two peak in the film, t=0 moment suddenly let go, according to the common sense of life can be expected, the two position of the film back to the future shock, at the same time the wave propagation and wave and the wave will be at the meeting point superposition. Programming with MATLAB and visualizing the process.)