Film is an art that creates images and expresses life in the time and space of motion by taking pictures and sounds on the screen as the media. The comprehensive audio-visual image that directly appeals to the audience's senses is the main aesthetic feature that distinguishes movies from literature (indirect image of words), plastic arts (pure visual image) and music (pure auditory image). The fluidity and freedom of time-space conversion of screen audio-visual language make it break through the stage limitations of drama and dance, which are both "comprehensive arts". There are two levels of screen language. The first level is the screen modeling world composed of environmental space and characters. Environment (space) modeling is the location and characteristics of the story. 1. What time, what light, color, tone, etc. 2. Character modeling, that is, the figure, head shape, appearance, hair accessories, clothes, etc. 3. The movement formed by the modeling lens scheduling and actor scheduling of the relationship between people and space: people and space do not move, people and space do not move, and people and space move. The second level includes the overall modeling form and style of the film, that is, whether the tone of the film (composed of light and shadow, color, structure and trend) is unified, 2. Sound ① Sound elements-human voice, sound (various sounds in nature and social life), music and silence (silent fragments processed subjectively) ② The law of sound application and the combination of sound and painting-sound and painting jointly create the artistic conception of film art.