Abstract: Cutting out board paper is the first processes with the band saw lumber,cutting out board paper process with numberical control (NC) band saw machine process must be carried out software design,moreover,base of software design is the mathematical theory of establishment,putting forward NC machining mathematical model and process simulation of flitch cutting out edge is computer programming equation with for the optimum method of sawing flitch and provide mathematical methods for the video reproduction. It provides theoretical basis for cutting the board paper,the board paper accurate detection and provide theory of the digital control. By the NC technology and modern technology and lumber process integrating,will allow NC for the traditional wood processing technology and can promote the development of the timber industry machining process in the computer research of mathematical description. It promotes the development of the timber industry machining process and mathematical description of theoretical study.

Key words: log, board paper, numerical control, cutting out edge, simulation