Abstract:In view of the unclear status quo about the synergy effect of central and local policies in China's fuel cell vehicle industry and to what extent it promotes the innovation and development of multi-subject industries, this paper discusses the synergy of central local industrial policies and their effects in depth, so as to effectively play the joint force of policies to promote the development of the industry. Focusing on the key role of promoting multi-agent innovation as an industrial policy, based on the analysis of the policy mechanism of opening up the innovation chain and industrial chain integration channel, the policy coordination theoretical framework of the central and fuel cell vehicle demonstration city clusters is constructed, and a total of 9 subdivision measures are divided into three types of policies from the role level: promotion, pull and guarantee, and 153 policies of the central government and five demonstration city clusters from 2011 to 2021 are used, and the state synergy model and composite system synergy model are adopted. Sample data analysis is carried out from the perspective of multi-agent innovation, and regression analysis is applied to test the promotion effect of policy synergy on industry development. The results show that the coordinated evolution of central and local policies of the three types of policies is "W"-shaped, and the overall coordination degree is improving, but the process is not stable enough; the level of coordination between the central and local governments of the 9 subdivision measures is generally high, accounting for 71% of the high degree of coordination; although the degree of synergy of the central and local policy composite systems shows different fluctuations, they all reached the highest level of coordination in 2020 and 2021; and the degree of policy coordination has a significant positive impact on the innovation performance of the industry. Therefore, it is proposed that for the future of fuel cell vehicle industry, the central government should strengthen guidance and planning of multi-subject innovation and promote the integration of industrial chain and innovation chain; local governments should improve the allocation and operation mechanism in the process of policy implementation, and steadily improve the synergy of the three types of policies.