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The deformation displacement of the structure in shaking table test is one of the important measurement parameters.Using the machine vision technology to the measurement of the deformation displacement in shaking table test is a complement of sensor measurement,providing more data sources from another channel.This method firstly gives vibration table an excitation signal,and collects the video for the elastic structure specimen with the artificial marks fixed on the vibration table.Secondly,to do image preprocessing such as image gray, the image enhancement about this video image sequences ,and the artificial marks recognition.Next,the least-squares ellipse fitting method is adopted to complete object localization on the basis of identify all artificial marks and the pixel calibration.Then,the deformation displacement will be calculated by the pixel displacement and the target pixel calibration coefficient.Finally,the feasibility is proved through the experiment when the fixed displacement signal and sine signal are applied to the shaking table. 