The "mirror image theory" is the product of the Renaissance, and it must have been put forward by Leonardo da Vinci. This famous theory of self-painting has been very popular and dominant since the Renaissance, and later it was summarized as the basic principle of all artistic theories (including literary theories), that is, the theory of representation. It holds that nature and human life are the objects of literary description, and the artist's task is to reproduce it with different media (language, canvas, color, lines, notes, etc.). ). The representatives are Balzac and Chernyshevski. Generally speaking, "mirror theory" means that literature (art) is like a mirror, and the author (artist) uses this mirror to illuminate the world (nature) and make literature (art) truly reflect the world. Its essence is "truth correspondence theory". However, the "mirror theory" advocated by Leonardo da Vinci is not a simple mirror mapping. He also emphasized that nature is the first copy, while art is the "second copy" of nature, which is shaped by considering nature and "extracting the essence" from it. This is the second nature theory.