It is a rising non-contact measuring method to detect minor distortions and displacements using digital laser speckle images. To improve the speed of this measurement method, a new speckle tracking method—digital speckle marginal correlation (DSMC) method is presented after the research of digital speckle correlation measurement (DSCM) method and speckle images′ characteristic. The speckle images′ pixel sum of every line and column is computed to make the light energy accumulated to the margin, and then uses only the two sequences to find the displacement of speckle images by correlation and interpolation method. And the displacement of speckle image reflects the distortion or displacement of objects. The theory and experiment proves that this method is feasible and it reduces computing time greatly without damaging the computing precision, because the precision of the measurement is mainly determined by the number of interpolation points and the synthesis noise of the digital speckle images themselves.