In this paper, we also gived some discussions about how to design thelight road to obtain large viewing angle and how to choose taking parameters to obtainhigh diffraction efficiency.

With the development of the technology of military affairs, the chariotwhich do battle in the water want to do the exactly observation of theunknown circumstances before landing, the driver and the observer in thechariot have to do the periscope observation for 3D image on the land, thispaper designs the stereo vision observation system by the technology of 3Ddisplay for the requirement.