With the deepening of globalization, latecomer firms continue to emerge in the market and are gradually evolving from innovation catch-up to innovation frontier. Although there are already latecomer firms that are fully developed and gradually located in the leading position in the innovation ecosystem, there is little research on the mechanism of the dynamic process of catching up with the leading firms based on the same innovation ecosystem in the context of innovation catching up. By analyzing the longitudinal case study of the fire-fighting enterprise Tanda, the analytical framework of "catching-up pressure - catching-up process - catching-up result" is built. It is found that in the ecological integration stage, the three windows of opportunity, namely, technology, system and market, comprehensively identify and guide enterprises to adopt different strategic responses, which expands the research on the coupling of windows of opportunity and strategy; In the innovation catching-up stage, the evolution of innovation is characterized by a progressive trend from "imitation innovation - independent innovation - collaborative innovation"; The integration of innovation ecology shows a gradual deepening process from "embedding" to "evolution" to "stabilization", and realizes its own ecological position in the innovation ecosystem.Through this study, we hope to provide reference ideas for further research on the theory of window of opportunity, to further improve the research on catching up of latecomer enterprises in China, and to expand the theoretical research system of innovation ecosystem.