A novel ESPI optical set-up is presented for the measurement of the whole field in-plane displacement. The problem of the whole in-plane displacement measurement in the transient or non-repeatable situation can be solved with this technique. The laser beam is splitted into four beams that are arranged in the horizontal and vertical planes, respectively. The optical set-up is arranged according to the laser′s polarization. The polarization directions of the lights in the horizontal plane are the same and so do the lights in the vertical plane. Howerve, the polarization directions in the two planes are orthogonal. The whole field in-plane displacement of a rotating plate is measured with this technique and a satisfactory result has been obtained. The speckle fringes corresponding to horizontal and vertical components are obtained with the same speckle pattern.