Using data of manufacturing listed companies from 2011 to 2019, analyzes the mechanism of internetization on durative innovation from the perspective of policy incentives. The empirical results show that internetization of manufacturing companies has a significant positive effect on durative innovation. The positive effect is more obvious in the growing and maturing period, private companies, large and medium sized companies; in the declining period, internetization will generate innovative bubbles. Internetization can help the government to better identify companies with innovation ability and give corresponding policy support, compared with the government subsidies, the policy incentive of tax refund has a better effect on durative innovation of manufacturing companies.