This paper uses the method of formal model construction to model the path of enterprise sustainable innovation and explains it by case analysis. Some suggestions are put forward then. In the changing market environment, enterprises can adapt to and strive for more living space only through continuous innovation. The construction of a sustainable innovation loop makes the previous research on sustainable innovation become relatively concrete from the abstract. Enterprises should construct and complete the loop of innovation path according to their own characteristics. In the process of launching Lark, ByteDance takes scientific and technological innovation as the basis, and business model innovation as the key link, and finally completes the cycle of innovation path, and the innovation is still ongoing, achieving the purpose of sustainable innovation, reflecting the enterprise innovation strategy and corporate culture.