SD+CD yarn is also known as dragon yarn and yilongsha. SD+CD yarn is made of cationic dyeable polyester and ordinary polyester through ply texturing. In the meantime, the long and short pitches that change with the use of uneven air intersection will produce the effect of alternating changes in two colors on the surface of the fabric after weaving. Different cationic ratios can achieve different two-color effects, such as different colors, shades, white space, etc. Different product specifications and interweaving methods can obtain different stripe, lattice, jacquard and other two-color effects, making the fabric style more diversified.