Abstract: The needle bar and the thread-taking-up are main mechanism to form the thread trace of the embroidery in computerized embroidery machine,exerting great impact on the forming of high quality thread trace of the embroidery.This paper deals with the study of the original thread-taking-up mechanism and sets out a new design of periphery cam with flat-bottomed pusher style thread-taking-up mechanism while maintaining the movement regularity of the original thread-taking-up mechanism.It deduces the theoretic design equation,gets the contour curve of the periphery cam,and manufactures the new-model thread-taking-up mechanism for computerized embroidery machine.Experiments of the new mechanism prove that it possesses excellent working performance.