Polyurethane (PU) synthetic leather has been developing rapidly since its entry into China in the 1980s. In the 1990s, China's PU leather industry gradually formed a complete industrial system. There are hundreds of wet and dry production lines and the market competition is unprecedentedly fierce. With PU leather market matures and China's economic development, the quality of PU leather products, varieties of higher and higher requirements. At present, foreign technology exchanges are frequent, many foreign advanced technologies and novel products are soon being sucked into China, and product development has been put in a very important position by manufacturers. This article combined with my experience in the development of the company, the current PU leather product development and technological progress and we make an exchange and discussion. 1PU leather processing technology 1.1 Technology System PU leather technology in Japan system and the Italian system, Taiwan Province, South Korea technology is a Japanese system. Japan's chemical, chemical fiber and textile technology is very high. The research and development of PU number, fabric and fiber are more in-depth. They pay more attention to the inherent properties of product strength, moisture permeability, PU film structure and high technical content. Such as Japan, South Korea's production of ultrafine fiber leather and high-end sports shoes and ultra-fine knitted fabrics wet garment leather have shown a very high level of technology. Italian synthetic leather products are more affected by the leather processing technology, the appearance of many changes, high-quality art, the product design and fashion more stress. The main products for shoes, bags supporting. 1.2 wet coating process Wet PU leather products due to its appearance, feel and inner properties closer to the natural leather, the development of fast. The level of wet process determines the overall level of wet PU leather products. Wet coating technology with each passing day. 1.2.1 wet coating PU film structure control Wet coating PU film structure on the wet PU leather products inherent performance and feel a great influence on PU raw materials and additives can be selected and cellulose added Proportion to control. The amount of cellulose on the wet PU leather products have a great impact. Cellulose PU foam cell increases, improve the moisture permeability of the membrane, while reducing the density of the PU membrane. Sneakers because of its harsh environment, inherent performance requirements are high, often without cellulose, high-grade leather is also rarely used. Leather shoes due to the requirements of wearing comfortable, and the inherent performance requirements slightly lower, you can add the right amount of cellulose. For shoe leather, because of its high moisture permeability, it is necessary to increase the amount of cellulose. You can choose a special PU raw material to control the structure of the PU film, such as PU with high viscosity and low solids content or low solid content of raw materials to adjust the structure of the PU film. In addition, wet process, additives on the formation of PU membrane structure also played a significant role, as a major means of regulation. 1.2.2 Appearance To make PU leather products look like genuine leather, first wet coating products look close to the leather. Italy more use of impregnation process, and then through the back sanding, to achieve this effect. However, the intrinsic properties such as rebound of impregnated products are not as good as those of scraped products. By improving the doctor blade coating process, it is now possible to produce wet coating products that combine the inherent properties of a scratch-resistant product with the appearance of an impregnated product. In addition with non-woven fabric as a base fabric or woven fabric on the back of the way to make PU leather look close to the dermis. The island of microfiber non-woven fabric for the production of wet PU leather, the appearance of the most like leather. This fiber has a fineness of 0.0011dtex, or even 0.00011dtex, more like natural leather's collagen fibers.