(Hand-painting is an important professional compulsory course for students majoring in architecture, clothing display design, window design, home design, space flower art, fine arts, gardening, environmental art, photography, industrial design, visual communication, etc. In the learning process of renderings, copying is a very important content and link. It is an important indicator to measure the hand-drawing ability of college students. At the same time, it also has a great impact on the graduation and employment of college students.)