According to the acousto-optic effect, a measurement system of the vibration in the solid surface was built by laser diffraction. When the laser beam illuminated obliquely to the liquid surface wave caused by the vibration, the clear and very high diffraction pattern was observed. The diffraction pattern was scanned by use of MATLAB software. The light intensity distribution of the diffraction pattern was received. Based on the analytical relationship between the diffraction pattern width and the amplitude of the surface wave, the amplitude was obtained. And its size was in microns category. When the depth of the sample pool was changed, the surface wave amplitude was given. The relationship between liquid depth and the amplitude was provided. And the amplification effect concerning the vibration of the liquid was found. Then the vibration amplitude in the solid surface was got. Therefore the micro vibration in the solid surface was achieved.