In this paper,we analyze development and defects of image processing techniques and provide some recognition algorithms to detect the structural parameter in woven fabrics,such as warp and weft densities,yarn diameter,linear density of the yarn and yarn twist angles using Digital Image Processing and realize automatically function of system with mixed program VB and MATLAB.

This article with the help of instrument principle analyzed the common failures occured during the use of Y331A model yarn twist tester, and put forward some approaches to fixing breakdowns.