1. Make the stage picture clearer: enable the audience to see what or some corners of the stage are not visible to the audience (now).
2. Strengthen the effect of the stage performance: in line with the needs of the plot, make the background appear natural, play a role in setting off, suggesting and inducing the development of the plot, and adjust the atmosphere (actor, audience). Principles of use of stage lighting: 1) Intensity (refers to the brightness of the light): There must be enough light to allow the viewer to see the color, appearance and details. 2) Assignment: Including the distribution of the use of the light and the direction of the direction of the shot, the subject must be distinguished from the supporting angle and the background by a distinctly different (color) brightness. 3) Color: rely on color paper, computer coloring, etc. to meet the needs of the plot. 4) Change: According to the needs of the plot, the color, brightness and movement of the light are changed. In the specific use of stage lighting, before reducing a certain light source, it should be prepared to enhance the next light source, in addition to the special needs of the plot. Avoid black noise, so as not to affect the work of the cast members.