It aims to study the sustainability of multifunctional furniture, prolonging the use cycle of multifunctional furniture, increasing the probability of recycling, reducing the waste rate of waste furniture and improving the overall utilization of multifunctional furniture. Based on the whole life cycle of the product, it analyzes the sustainability of the multifunctional furniture, In each stage of the life cycle, the sustainable utilization of multifunctional furniture is improved, then the modular concept is used to design the structure, and the design of multifunctional furniture is improved through the TRIZ theory. In the use of the TRIZ theory, the problems that need to be solved are transformed into the special terms in the TIRZ conflict matrix, and then the corresponding solutions are obtained in order to increase the sustainability of multifunctional furniture at every stage. The multifunction furniture is redefined on the basis of the product life cycle, and the new definition of multifunctional furniture under the sustainable concept is put forward, and the design process of multifunction furniture is put forward. Furniture design with multi-function furniture design process can effectively enhance the sustainability of furniture.