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