Graffita means (scribble) in Italian, while Graffiti (its plural form) refers to an image or painting that is scribbled on the wall. Basically, graffiti is a kind of behavior close to words, which accounts for a large proportion, and symbols, signs and graphics of images are also common contents, but most images briefly show their intentions in a way similar to words, without deliberately describing them. But in the later graffiti art, pictures, symbols and signs, in turn, overwhelmed the words and became the dominant in graffiti art. Compared with words, pictures can better reflect what the author wants to express and the dominant idea of the work.