In the development of flat panel display techniques and digital image processing techniques, the data processing ability progresses so greatly, and it makes the three-dimensional display (3D display) possible. Recently, the 3D display technique develops so fast, it changes totally the traditional 3D viewing effect and makes 3D display become a possible technique in our daily life. In this paper, the different 3D techniques will be reviewed, and much more focus on the real spatial 3D display techniques, especially the challenges of the high-quality spatial 3D display to the optoelectronics will be analyzed, which will be the sources for the future ideal 3D display technique.