At present, the so-called holographic projection applications in the market all refer to pseudo-holographic projection, because they all need media, that is to say, they are not presented in the air. There are three main effects in the market, 18 degrees, 27 degrees and p>36 degrees, which means the visible range, and then many application effects can be made according to these three effects, such as on the stage, in the exhibition hall, on the showcase and below.