High shrinkage fibers are fibers that have a particularly high shrinkage after heating. The shrinkage of ordinary polyester after heating is only 10%, while the shrinkage of high shrinkage polyester after heating is as high as 50%. After the fabric is heat treated, the fabric is particularly dense and full due to fiber shrinkage. If the part of the fabric is made of high-shrinkage fibers, a pattern with a strong three-dimensional effect such as seersucker or jacquard will appear after heat shrinkage. A high-shrinkage fiber is used to make a pile fabric of chemical fiber velveteen and corduroy. When the base fabric is contracted by heat, the pile can be made denser. Blended or interwoven with pure polyester high shrinkage fiber and conventional pure polyester fiber, the fabric can be obtained by heating and setting, and various corrugated pure polyester fabrics can be obtained. Fine-knit polyester high-shrinkage filaments can be used to make suede and silk.