In order to improve the efficiency of automatic assembly and design update of product

a design method is presented that the layout-driven automatic assembly and update of product based on three-dimensional model.Hereinto

positional and dimensional relations of product structure are ascertained

and that corresponding relations

parameters and design references are designated

and that three-dimensional model template is established and automatic assembly is realized.On Microsoft Visual C++ 6.0 integration environment

software development toolkit Pro/TOOLKIT is used to program in order to implement search and modification of design parameters and relations

and then a new design scheme is created in line with new parameter value.The results show that it is feasible to accomplish automatic design and update of robot under different working conditions.By this method the automatic assembly and design update of product can be accomplished easily

and this method has been applied to design process of move-in-mud robot.The results show that it is feasible to accomplish automatic design and update of move-in-mud robot under different working conditions.