Abstract: In the traditional measuring methods,the bending modulus of yarn is mostly expressed in the force and the corresponding degree of flexibility produced as the sample being bent.However,the measured results acquired from these methods tend to be affected by the confining conditions and the basic hypotheses,thus are not comparable.In this paper,a new model to measure the bending rigidity is constructed,based on the yarn-hung configuration and the definition of bending rigidity in the engineering science.The parameters in the resulted formula are relatively easy to measure,which makes the formed method applicable in practice.