Abstract：As an efficient and reliable method in 3D reconstruction and active measurement, structured light vision technology is being more and more important. In a structured light system, accurate reconstruction depends on the correct correspondences between the points in the image and the points in the projected pattern, where a proper codification method would be crucial in real applications. In this paper, after a brief introduction of the coded structure light system, a survey is then presented to summary the existing codification methods. The advantages and limitations of the different methods are discussed. Finally, a summarization of the codification methods and a discussion of future trends are provided.