With the continuous improvement of living standards,people have higher requirements for the texture and appearance of fabrics,and yarn defects directly affect the texture and appearance of fabrics.In the continuous development of raw materials and yarn varieties,updates and improvements in related equipments and processes can improve the texture and appearance quality of fabrics.Therefore,it is necessary to strengthen the analysis and control of yarn defects to improve yarn quality.Based on this,this paper analyzes the causes of yarn defects.