Selection of coordinate axis and calculation of coordinate point direction in apparel CAD system

In the clothing CAD system, the grading of the clothing pattern occupies a very important position. In this paper,we enumerated and analyzed the problems that often occur in the operation of pattern grading CAD system. And focused on how to select the vertical and horizontal coordinate axes and calculate the plus and minus signs of the grading points of clothing pattern before grading and inputting the grading values in pattern grading CAD system, and then brought them into the women's suit pattern for application and verification. At last achieved the purpose of improving the efficiency of pattern grading.