To compensate for the nonlinear gamma error in the process of structured light 3D(three-dimensional) measurement, the gamma correction method based on the phase shift method is proposed in this paper. The technologies of structured light measurement and the 3D reconstruction are studied. Firstly, introduce the basic principles of structured light measurement and structured light measurement method based on sinusoidal fringe image. Secondly, the gamma correction method based on the phase shift method is studied, and the validity of the method is verified by experiments. Finally, the 3D reconstruction images before and after correction of the measured object are obtained through reconstruct experiment, and the analysis and comparison are made. The experimental results show that the correction algorithm designed in this paper can effectively reduce the RMS(root-mean-square) value of the phase error caused by gamma distortion in three-dimensional measurement. This method improves the measurement accuracy and has practical value.