Abstract: In order to control the weft tension and its amplitude and improve the quality of fabric,the experimental data of yarn tension at different weft inserting motions with different yarns based on TT96 type rapier loom with electronic weft insertion partly modified were analyzed and compared.The results demonstrated that the weft tension and its amplitude can be effectively reduced and positively controlled to meet the requirements of weaving provided that suitable weft storage feed unit,weft feeding position and tension device are selected,modified trapezoid acceleration motion with smaller peak acceleration as the law of weft insertion motion is adopted,and the route of weft yarn motion is optimized.