This paper presents a method that generates a topological structure under an impulsive load by the extended distinct element method (EDEM). The EDEM model consists of non-linear springs, dampers and sliders between two elements in both the normal and tangential directions. According to the local rule using the calculated equivalent stress, elements are generated or eliminated. From numerical results, it demonstrates that various topological structures are generated by the initial shapes. It is also possible to obtain the design of the structure which is not limited to the design space.