An improved electronic speckle pattern interferometry(ESPI) is presented to overcome the difficulty of ESPI in large displacement measurements.The large displacement of tested object causes the decorrelation of speckle pattern before and after loading and the deterioration of the fringe visibility.Therefore,no phase information corresponding to the deformation can be obtained.Digital speckle correlation method(DSCM) is incorporated into ESPI.DSCM is used to determine two-dimensional in-plane displacement,which is applied to rearrange the recorded speckles before and after deformation to retrieve the interference fringes.ESPI optical setup,which is sensitive to out-of-plane displacement,is adopted,so the phase map including out-of-plane displacement can be obtained with phase-shifting techniques.Therefore three-dimensional displacement can be obtained by integrating out-of-plane and in-plane displacements.To validate the new method,the experiment is provided.The tested object is an organic glass plate clamped around and forced in center.The results show that good quality fringes can be restored successfully.It proves that the method is feasible.