Abstract: In order to design and manufacture a warp-knitting machine crochet cam to replace old one which is easy to wear,a new reverse design method is proposed by measuring the cam curve data by 3-D CMM,plotting the cam curve in MatLab,modifying the cam curve further,filtering the collected data,processing the filtered data by cubic spline interpolation in MatLab,and sending the new data to AutoCAD to generate compliable cam contour curve by Excel.The results of experiment show that the cam manufactured in this way satisfies production requirement, vibration decreases and noise declines,it can be used as reference for similar cam reconstruction.