Stereoscopic display technology can be classified as head type and nakedness-eye type according towhether viewers wear the equipment or not. Head type is classified as polarized glasses, color complementary glasses,shutter glasses and helmet. Nakedness-eye type is classified as grating display, holographic display, integral imagingand volumetric display. The principles, structure, advantages, disadvantages and the art-of-state research development of stereoscopic display technology for head type and nakedness-eye type are introduced respectively. The status ofstereoscopic display technology is analyzed. And the future of the technology is forecasted.