Abstract: In order to meet the requirements of the frequent replaced key components design parameters applied in the completed design of the mine excavator for th e customs,a reusable design system of mine excavator was developed. With the analysis on structure functions of the excavator's components,the reusable components W ere refined.The second development conducted with the UG NX parameteric design method and the database techonlogy,the reusable component database and the param eteric design system were established. The problems that frequent and complicated design changes and long design period existed in the traditional design were solved.Th e system with a menu login interface,modularized design platform,parameteric three dimension drawing and visualfunction could realize the direct visualized interface,the a pplication effected of the simple operation and be favorable to the product design and development.