Abstract: A two-step scheme is proposed to improve the performance of dynamic 3D shape measurement according to its characteristics. 1) The initial 3D shape of the object and the corresponding 3D coordinates of feature points in the 2D image are obtained by measuring the static object or its CAD model. 2) Carry out the 3D measurement in the process of object motion and change. By detecting the feature points in the dynamic image, the motion parameters of the object at different times are calculated according to the corresponding relationship between two-dimensional and three-dimensional coordinates. Then the approximate shape of the object is estimated from the initial shape. The approximate phase of the fringe pattern at this time is calculated. Then, combined with the approximate phase and the wrapped phase of the actual fringe, the unwrapped phase is calculated, and the 3D shape of the object at that time is obtained. Compared with the temporal phase unwrapping method, the proposed scheme improves the measurement speed under the same measurement reliability. Compared with the spatial phase unwrapping method, this scheme improves the measurement reliability at the same measurement speed and is not affected by fringe discontinuity. A static and dynamic dual-mode 3D measurement system was built by using a DLP projector and high-speed camera. The 3D shape measurement of 1280×1024 points at 70 f/s is realized. The experimental results show that the scheme can measure not only the rigid moving object but also the non-rigid moving object, as long as the fringe change caused by its deformation does not exceed half a period. The proposed method has a large tolerance for the change of object pose at adjacent times as well.