The "golden section" is an artistic aesthetic standard produced by the curious "golden section value", an aesthetic measure of artistic appreciation and creation, a crystallization of human aesthetic concept from perceptual to rational understanding, and a very important knowledge point in the teaching of "painting composition". Correctly understanding and mastering the "golden line" in junior high school art teaching is the key to the teaching effect of "painting composition" Therefore, the newly compiled junior high school art textbook puts the study of "golden line" in a very important position, and adds a conspicuous "composition analysis line" in the textbook, trying to help students master the principle of formal beauty of painting composition and improve their ability to feel, appreciate and create beauty.