Abstract: Different to that of short-fiber yarn, textured yarn’s mass evenness has nothing to do with its appearance evenness. According to the results of EIB test, there are not obvious difference between the air-jet textured yarn and the short-fiber yarn in the case of CV, while the differential shrinkage filaments air-jet textured yarn share the same CV with the short-fiber yarn; The air-jet textured yarn’s appearance diameter changes more than that of short-fiber yarn; For the air-textured yarn, the frequency of appearance diameter diversification mainly stay in -25%~25% short segment area. For the differential shrinkage filaments air-jet textured yarn, it’s in -25%~50% longer segment area, this is also the same as short-fiber yarn. According to Uster® test, both air-jet textured yarn and differential shrinkage filaments air-jet textured yarn have a lower CV than the short-fiber yarn, this is beneficial to maintaining their mechanical properties.