Abstract:Under different life cycles, enterprises have different innovation intensity, innovation demand and financing constraints, and the effect and mechanism of financing policies may also be different. In order to further understand the impact of financing channels on enterprise innovation and the regulatory role of enterprise life cycle, from the perspective of enterprise life cycle and nonlinear effect, based on the data of listed companies in China from 2008 to 2022, By increasing financing constraints, reducing R&D investment, and reducing capital investment, the influences of various internal and external financing channels on enterprise innovation are investigated to provide theoretical and empirical basis for the precise allocation of financial capital. The results show that the financing channels such as government subsidies, tax incentives, private funds and equity financing have obvious promotion effects on enterprise innovation, but with the passage of time, the incentive effect of these financing channels is gradually weakened, while bank loans will hinder the innovation of enterprises. The influence of different financing channels on enterprise innovation varies according to different stages of enterprise life cycle. The overall performance of incentive effect will weaken with the advance of enterprise life cycle, and the impact on innovation of non-state-owned enterprises is more significant than that of state-owned enterprises. The influence of financing channels on enterprise innovation presents a U-shaped or inverted U-shaped relationship, in which the inverted U-shaped inflection point of government subsidies is 3.3%, the inverted U-shaped inflection point of tax incentives is 4.0%, and the U-shaped inflection point of bank loans is 48.1%. There is a nonlinear relationship between main financing channels and enterprise innovation, and the current financing channel is on the left side of the inflection point. It shows that the influence range of each financing channel is moderate. Finally, according to the research findings, the paper puts forward countermeasures and suggestions to further stimulate the incentive effect of financing channel innovation.