Abstract: To meet the market demand for various type of weft-knitted fabrics,this paper made a further study on the development of weft-knitted fabric design system based on CAD technology.Combined with the stitch design features, mathematical models of knitting plan and jacquard pattern were established respectively, using two and three dimensional matrix models to represent the corresponding data.Besides, the mathematical expressions of needle set-out, cams arrangement and the transformation algorithm of the jacquard pattern were illustrated.Also the the specific implementation process was described in detail.Based on the theory, CKCAD1.0 weft-knitted CAD system was developed with Visual C++ and the function of process design was realized. The weft knitting product design became more intuitive, rapid and accurate.

Key words: weft knitting, knitted fabric, CAD, design model