Abstract: To adapt to the development of modern digital spinning,after making analysis and comparison of the commonly used expression ways of variable layers weave of the woven fabric,a new mathematic expression of it is put forward.It is composed of layers array and warp position code array,i.e.,the weave is expressed by digital form,which is characterized by simplicity,information technology,and easy operation.Based on this expression,a corresponding method of drafting which has direct correlation with the expression and easy to be computerized is presented,providing a mathematic way for drafting of variable layer weave of any number of layers of the woven fabric.This method has practical application value for CAD of variable layer of the multilayer woven fabric.