Shoes have a long history. About 5000 years ago, during the Yangshao culture period, the most primitive shoes made of animal skins appeared. Shoes are tools for people to protect their feet from injury. At the earliest, people invented fur shoes in order to overcome special circumstances and prevent their feet from being uncomfortable or injured. With the development of shoes, they have become like this, and shoes of various styles and functions can be seen everywhere. To identify the quality of shoes, we need to focus on the appearance and internal indicators. Because the internal indicators often need the help of testing instruments, it is more practical for a consumer to identify the quality of shoes from the appearance.