The development of emerging technology industry is an important way to reshape the international competition pattern, open up new fields and new paths for development, and shape new momentum and new advantages for national development. However, the development of emerging technology industry not only faces the double uncertainty of technology and market, but also faces the challenge and competition of old technology.The combination of creation and then destruction is an important policy implementation strategy of the Chinese government to coordinate the competition between old and emerging technologies and promote the development of emerging technologies. The strategy combination of creation and destruction refers to the policy implementation strategy set that promotes the growth of emerging technologies and gradually replaces old technologies. However, the creation and destruction strategies have their best background conditions, and the optimal combination of policy implementation strategies should be determined by combining the implementation scenarios and characteristics of innovation policies. How to implement the combination of creation and destruction strategies for emerging technology industries has become an important practical policy issue.

Therefore, this study takes the combination of creation and destruction policy implementation strategies as the theme, takes the adoption of innovation policies in China's new energy automobile industry as a case, analyzes the specific process of the Chinese government's promotion of creation and destruction policy implementation strategies, and focuses on the question of how to determine the combination of creation and destruction policy implementation strategies? What are the paths of creation and destruction? What is the logic of the strategic combination of creation and destruction? The research conclusions have practical significance for improving the implementation efficiency of innovation policies.

The findings are as follows: (1) the dynamic adjustment process of combination of creation and then destruction are a discretionary process. In the three stages of "achieve innovative breakthroughs", "achieve commercialize" and "enhance international competitiveness", the Chinese government successively adopted the policy implementation strategies of "creation first", " simultaneous combination from creation and destruction" and "creation from destruction"; (2) The implementation strategy of combination of creation and then destruction requires a systematic realization path. "Creation" includes the layout and cultivation of diversified technologies, the creation of market opportunities for commercialization of emerging technologies and the creation of technological opportunities for innovation of emerging technologies. "Destruction" includes reducing the relative competitive advantage of old technologies, breaking the policy protection space of emerging technologies, and destroying the mainstream technical route expectations and visions of old technologies. (3) combination of creation and then destruction are essentially the government's behavior of intervening the competition between old and emerging technologies by creating and adjusting the policy protection space, which reflects the organic combination of "promising government" and "effective market".

The contributions of this paper are as follows: Firstly, it puts forward a three-dimensional theoretical analysis framework of "goal-setting - strategy selection - implementation path" for innovation policy implementation strategies, which opens the black box of the combination of innovation policy implementation strategy in the field of new energy automobile industry in China. Thus, we enrich the research on innovation policy. Second, it interprets the theoretical logic of the combination of creation and destruction strategies, reveals the coupling relationship between "promising government" and "efficient market" in the development process of emerging technology industries. It can expand the theory of policy implementation, and is conducive to improving the efficiency of policy implementation.