A three-dimensional (3D) data registration method based on flexible control points is proposed to solve the problem of data registration in the global measurement of large-scale components. This paper introduces the principle and experimental measurement process of stepped 3D data registration method based on machine vision. It avoids the tedious process of pasting marks on the components and improves the measurement efficiency by projecting flexible control points. And the standard ruler and the panel are measured to verify the proposed method in the laboratory. The experimental results show that the method is effective and can meet the field measurement requirements of large-scale components.