介绍了电子散斑干涉计量（ＥＳＰＩ）原理，推导了ＥＳＰＩ求挠度（离面泣移）的公式，设计了测量悬臂板离面位移的光路，用Ｃ语言编制了相应的数字图象处理软件，得出相关条纹图，计算了悬臂板的离面位移，并与双曝光全息干涉法作了测试比较，结果很好符合。 The principle of electronic speckles interferometry (ESPI) was introduced, the formula for ESPI’s deflection (out-of-plane crying) was deduced, the optical path for measuring the out-of-plane displacement of the cantilever plate was designed, and the corresponding digital image processing software was written in C language. Correlative fringe maps were obtained and the out-of-plane displacements of the cantilever plates were calculated and compared with the double exposure holographic interferometry. The results are in good agreement.