When using different yarn number, different slub thickness (basic yarn and slub yarn with slub ratio), length and pitch, using single warp or single weft, warp and weft yarn equipped with two-way slub yarn, ordinary yarn and the appropriate proportion and arrangement of the same quantity or different quantity, can produce all kinds of denim bamboo, garment washing processing to form all kinds of hazy or clear grid jeans, which is welcomed by consumers to the needs of personalized groups. Almost all early slub denim is spun with ring-spun yarn. Due to its short length, small pitch, and relatively high density of slub yarn, the cloth is easy to form a dense decorative effect and cooperate with slub. With the development of market demand, especially the weft elastic two-way bamboo denim products, the domestic and foreign markets are very popular. and some products as long as the organization. Good design can be used for single ring yarn, weft slub yarn ratio is appropriate, the same can be two-way slub denim effect.