Abstract: The optimization of blank layout is an important part of computer aided die designing. Based on the polygonal vertices algorithm, a new method based on range box is introduced for optimal layout in the blanking process. The key parameters such as feed pitch and strip width can be calculated only in the range box of the original polygon. The offsetting of the polygon is avoided in this method which is frequently used in other traditional algorithms that may cause interference and error in the pretreatment. Moreover, a practical and efficient optimization system for blank layout is developed on Inventor 9 with Visual C++.