Based on the practical production experience

this paper explores the methods to improve the utilization rate of materials. Based on the analysis of the algorithm of the rectangle and the special shape

the rule of the best placement strategy is established. After the verification of the modification process of the skin allowance

the reference basis for the allowance setting is provided

and the general part allowance setting principle is creatively proposed. Waste is reduced due to imprecise margin setting. Through the implementation of the program

the waste of materials is effectively reduced and the utilization rate of raw materials is improved.