In this paper, a new method for extracting speckle fringes of a holo-specklegram is presented. It is proved theoretically and experimentally that when the interrogation of a holo-specklegram from point to point is used, the fringes in the two side lobes are the Young's interference fringes of the first-order diffraction in the holo-specklegram and is identical with the central Young' s fringes. The two side lobes fringes have high contrast and no effect of background halation. It is processed by using computer digit image processing technique and the in-plane displacement of a static load object is calculated quantitatively.