Shoes are composed of upper, tongue, insole, midsole, outsole and various accessories. The structure of the sole is quite complicated. It can include all the components that make up the bottom such as the outsole, midsole, and heel. The common characteristics of outsole materials should have features of wear resistance, hydrolysis resistance, oil resistance, heat resistance, pressure resistance, impact resistance, good elasticity, easy to fit the shape of the foot, Thermal insulation, easy absorption of moisture, etc., There are many types of shoe sole materials, which can be divided into two types: natural materials and synthetic materials. Natural materials include natural base leather, bamboo, wood, etc., and synthetic base materials include rubber, plastic, rubber-plastic composite materials, recycled leather, and elastic cardboard. The following introduces several main synthetic soles and their respective advantages and disadvantages.