Ring screen projection is a kind of multi-media interactive projection with ring, arc or surface as projection screen. The ring screen projection is to surround the audience in the center of the ring screen. The ring screen presents a large picture, which fully meets the audience's visual requirements. In addition, the surround stereo effect and the content of the film are integrated to perform an immersive and beautiful audio-visual feast. The projection screen of the ring screen projection usually has 100 to 360 degrees of radian, which is mainly determined according to the specific site environment and demand.