Abstract: In order to improve the detection ability of concrete, stack migration imaging technology widely used in geophysics has been recommended. Data processing flow of stack migration imaging of pre-damage concrete beam was presented on the basis of the principle and the seismic prospecting data handling styles, propertied of elastic wave propagation in concrete material and inherent characteristic of concrete damage detecting. Accordingly, the imaging of the damage dimension and location could be obtained. It could provide practice and theory reference of quantitative and quantificational analysis of concrete damage for nondestructive testing technology persons.