Electrochemical machining is a process combined with electrochemical and mechanical actions. It has the advantage of higher efficiency, lower surface roughness, better quality and simpler equipment etc. According to the current development, topology optimization was introduced for the improvement of electrochemical machine tool and applied by the ANSYS software in this paper. Based on the result of the topology optimization, some improvement was done to the electrochemical machine tool. On the basis of the new FE model of the improved machine tool, the modal analysis and static analysis were carried out. By the comparison of the results between the former and latter, the weight of the machine tool is substantially reduced while the stiffness and strength reserved.