In 1980s, the United States is 50% of global output denim production, but in the recent ten years, Chinese, India, Pakistan, Malaysia, Turkey and Mexico established a large number of denim production factory, denim production center of the United States and the world has turned to low labor cost countries in asia. In 2000, China denim production is about 2424t, the import of indigo dye 759t, and in 2001, its yield has risen to 2717t, the import of indigo dye decreased to 702t. In the denim market, although cotton above suspicion doubt is most important, but there are also a series of blended fabrics, such as cotton / polyester (50/50) blended fabric, cotton and other fibers, such as Tencel, flax, jute, and wool yarn weaving together. These products are different from the denim on denim market many products, it gives the consumer product design of a high level and high value-added clothing. The use of ring spinning and mercerized elastic denim line, also can enhance the value of products, some companies have made investment in these areas. Ring spinning yarn has a strong performance, high softness and cotton denim surface coarse yarn appearance. The current global denim production of more than 2 billion meters, air spinning or ring spinning. In the past, the United States in the production of Weft Stretch Denim, denim to Europe is mostly by elastic or warp and weft elastic; now, people continue to develop with changes in fashion denim, through dyeing and finishing to obtain novel appearance and performance. The thick cotton denim pants and jackets have been used as material, but in 1990s, the performance of consumers