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In this paper, we focus on façade design of buildings used prefabricated walls, and we propose a method to design the prefabricated wall using topology optimization method. In this method, artificial design elements are added to the topology optimization method. In this paper, 2-axis symmetry and continuous pattern are adopted as the artificial design elements. Improved ESO (IESO) method is used for the topology optimization method. IESO method is improvement of initial ESO method, and in this method, benefits of BESO, Extended ESO, and CA-ESO methods are combined. In this paper, several numerical examples of computational morphogenesis of prefabricated walls are shown in order to verify the application possibility of the proposed method to the façade design of buildings used prefabricated walls.