In order to clarify the morphological characteristics of textured yarn, it is necessary to measure the crimp feature, crimp angle (or amplitude of crimp) and crimp length, as well as it's distri bution in fiber of textured yarn.These characteristics of stuffing yarn are observed by a microscope and a projecter, and the following results are obtained:The crimp length distribution curve of stuffing yarn has a unique form.The shorter the crimp length, the more crimps exist, but on the other hand, the crimp of torque yarn showed normal Gaussian distribution.By applying the “Column buckling theory”, it is attempted to clarily the mechanism of manufacturing process of stuffing yarn.This theory is partially effective to explain the above experimental facts and actual processes.