It is a new type of elastic composite fiber compounded with ssy elastic fiber raw materials and through special compounding process. It has the characteristics of ssy elastic fiber. In the use of fabrics, it can not only have the elasticity and characteristics of ssy elastic fiber, but also produce special fabric style characteristics. The fabrics are new and high-grade. Excellent elasticity and elastic recovery, soft handle, anti fouling and fluffy, sun and chlorine resistance, good moisture absorption and quick drying. After being processed into fabric, the fabric surface is smooth, wrinkle resistant and non ironing, with stable size, moisture absorption and quick drying, moderate elasticity and comfortable wearing. It is a new functional textile material. The appearance of this product has solved the weaknesses and shortcomings of the original spandex elastic fabric, such as fear of chlorine bleaching, poor setting, unstable elasticity, poor care, easy foaming, excessive elasticity, and stuffy wearing, etc