To measure the dynamic deformation of an object surface in real time accurately,this paper proposes a spatial carrier phase-shifting shearing speckle system based on a slit aperture.A Michelson interferometer was used to generate a shearing distance and a spatial frequency shift by tilting a small angle in one of the two mirrors.A slit aperture was used to control the speckle size and the spatial spectral width.The Fourier transform and inverse transform were applied to accurate calculation of the phase and to obtain the phase distribution by using only a single image.Finally,the shearing speckle system was used to measure the dynamic deformation of a circumferentially fixed thin aluminum plate with a point load at the center.The effects of optical system parameters on the measuring results were analyzed.The experimental results show that when the shearing distance is 25 mm and the slit aperture size in X direction is 1 mm,it is possible to obtain a better phase-map quality by using a higher spatial frequency CCD camera with a pixel size of 4.65 μm×4.65 μm and an image lens with a focus length of 8 mm.It demonstrates that the shearing speckle system obtains the information of deformation in real time under a capturing rate of 25 frame/s and an angle of view field 43.6°,and the measurable range of displacement peak value is from 0.5 μm to 30 μm.