A spatiotemporal phase-shifting profilometry is proposed in order to solve the problem of phase demodulation error for the low signal-noise ratio (SNR) fringe project ion in three-dimensional(3D) shape measurement.Firstly,four-step phase-shiftin g sinusoidal patterns designed by computer are projected onto the tested object by a digital-light-process (DLP) projector and the deformed fringe patterns are acquired by a CCD camera.The sampling pitch is determined by the Fourier tr ansform method.Normalized fringe patterns are obtained after the amplitude and backgrou nd intensities are determined by the phase-shifted method.Then multi-frame spatiotemporal phase-shifting Moire fringes are attained by the process of down-sampling with a sampling pitch and intensity interpolation in space domain for each four-step phase-shifted fringe image.Thus,the phase distribution of the Moire patterns can be calculated using two-dimensional spatiotemporal phase-shifting method.The phase distribution of the original deformed grating can be obtained b y adding the phase of the sampling point to that of the Moire pattern.Finally,the experiment for the facial mask is performed by fringe projection to verify the effectiveness of the proposed method.The results show that the reconstructed 3D shape shows visible distortion with the standard four-step phase-shif ting algorithm but remains fidelity with the proposed algorithm instead.