Abstract: The application of compact spinning technology to Modal fibers has been discussed.The parameters in carding,drawing,roving,spinning and winding processes are optimized.And on the basis of the theory of spinning,the assembled tension and the value of the press can be optimized,and proper rings,ring travelers and net loops are determined.After making comparison with compact spinning and common spinning,we find that compact spun yarn has the besty quality,less hairiness,better unevenness(only 10.75%) and tensile strength(20.73 cN/dtex).In addition,the compact spinning is characterized by low end-breakage rate and yarn defects,high production efficiency.