Abstract: The properties of the dyed top were measured using SIROLAN-TENSOR bundle strength tester,and the impact of its damage resulting from dyeing on spinning and yarn quality was analyzed.The findings show that,after dyeing,the mean loss values of tenacity,elongation at break and work-to-break of the dyed top are 5.79%,14.23% and 9.67% respectively,while the initial modulus increases by 93.52%.And broken ends,yarn CV,thick and thin places increase with the increasing of the initial modulus.