Abstract: Technological innovation is an effective way to protect environment. It's a question worth researching in the field of environmental regulation, whether different types of environmental regulation can become the driving force to promote technological innovation of industrial enterprises, and whether they have the heterogeneous effects in the aspect of regulation. This paper divides existing environmental regulation into three different types:command-control regulation, market-incentive regulation and public-participation regulation. We can get the intensity index of the three types environmental regulation based on the quantitative research of policy text, and use panel-data analysis methods to study their roles in technological innovation of industrial enterprises. The results show that the three different types of regulation have heterogeneous effects on technological innovation of industrial enterprises. Command-control environmental regulation has positive spot effect and negative lag effect. Market-incentive regulation can stimulate the technological innovation in a long period of time. Public-participation regulation only has a small incentive effect on enterprise technological innovation in the short term. There is a lack of synergies among different types of environmental regulation. Only the synergies between market-incentive and command-control environmental regulation have significant incentive effect on enterprises' technological innovation input. Therefore, in the process of promoting sustainable development, the government should pay attention to the timeliness of the effect of command-control environmental regulations, give sufficient time for market-incentive environmental regulation to play a role and promote the enthusiasm of public participation in environmental protection through the formulation of relevant policies.

Key words: environmental regulation, policy quantification, technological innovation, policy synergy