<p>Daily products (DPs) are frequently used in synergy due to lifestyle preferences and usage habits, evolving in response to shifting living needs. Given this dynamic, the integration of existing product functionalities emerges as a sustainable approach to innovative development. In this study, a novel user-habit-oriented hybrid Taguchi method is proposed, coupled with experimental frameworks designed to assess usability. Through rigorous experimentation, significant design parameters that enhance usability are identified and utilized to optimize the integration of multiple DPs. Validation experiments confirm that the proposed hybrid Taguchi method effectively integrates and optimizes the functions of multiple daily products, offering a promising pathway for sustainable product innovation. The design scheme determined by this method not only has high usability performance, but also suits the user’s lifestyle habits.</p>