Based on the principle of speckle photography, with charge-coupled device (CCD) as a recorder, electrically addressed liquid crystal display (EALCD) as a read-out element, the 3D phase measurement of a deformed object is performed. Using digital technology interference fringes displayed in real-time, instead of recording media used in the traditional speckle photograpy, can leave out the chemical process of developing and fixing. Using digital image processing technology realizes four steps phase shitting and with phase-unwrapping method 3D deformation phase testing is realized. So piezoelectric translator (PZT)、phase controller and so on can be omitted, thus testing system is simplified, testing time is reduced and testing precision can easily reach up to λ/10 . The experimental result shows that the research method is not only simple and high-efficiency, but also can obtain high contrast speckle fringes.