Fabrics with unstable dimensions (that is, with potential shrinkage) are shipped as finished products, and it is difficult to make garments with stable shapes (such as wrinkles at the seams, inaccurate flower shapes, poor forming effects, etc.), and the finishing effect during the wearing process Persistence is poor. It is necessary to improve the shrinkage of fabrics through physical and chemical methods. Different fibres have different shrinkage of fabrics. Wool fabric not only shrinks severely at the first time; but the subsequent shrinkage is also very prominent. The initial shrinkage of cotton fabric is larger, but the subsequent shrinkage is not high; the shrinkage of synthetic fiber fabric is small. In addition, the shrinkage of the fabric is also related to the yarn, fabric structure and processing.