众创空间具有正外部性，对其实施具有财政性质的备案认定政策是引领高质量创新创业发展的一项重要政策安排。基于国家众创空间备案政策的准自然实验，运用双重差分DID和交叠CS-DID稳定估计量ATT等方法，实证检验众创空间备案政策对众创空间绩效的影响。研究表明，众创空间备案政策能够显著提升众创空间投资绩效和孵化绩效，但在第3年之后呈减弱趋势。机制检验表明，备案政策主要通过财政补贴，进而通过技术创新效应和要素替代效应实现绩效提升。异质性分析发现，位于不同区域的众创空间，备案政策对投资绩效的影响没有明显差异，但在孵化绩效方面东中部显著高于西部地区。基于财政补贴的备案政策效应在第3年后呈减弱趋势，因而应围绕备案政策开发金融、人才、政府采购等更加丰富的政策工具，吸引市场和社会力量参与备案众创空间建设，让备案政策与其它政策工具联立互动，实现政策组合效应。

Innovation and entrepreneurship are key to enhancing competitive advantage in a constantly changing environment. There has been an explosive growth of mass innovation spaces since 2015,and it is partly because local governments have had significant results in cultivating technology-based small and medium-sized enterprises,promoting high-quality entrepreneurship,and creating new economic growth points. While the mass innovation spaces conform to the innovation characteristics of the new era. Because of their low cost,convenience,openness,and all-factor platform characteristics,maker spaces have unique advantages in promoting technology-based entrepreneurship,opening up channels for the transformation of scientific and technological achievements,and creating a good atmosphere for innovation and entrepreneurship.#br#The mass sourcing space has positive externalities,and implementing fiscal filing and recognition policies in it is an important policy tool to lead high-quality innovation and entrepreneurship. However,has this filing policy implemented on the platform been effective? What mechanism does the filing policy use to affect the performance of mass innovation spaces? How should the government adjust and optimize the filing policy in the next stage towards higher standards and quality?#br#This study regards the national innovation space filing policy as a quasi-natural experiment. Firstly,it theoretically explores the positive externalities of innovation spaces. Then,based on the statistical data of national crowd innovation spaces from 2015 to 2020,it evaluates the policy effects using a DID model. Because the filing policy has been carried out in batches,the time points at which different batches of innovation spaces are impacted by the policy are not consistent. Moreover,the filing policy of the mass innovation spaces can be considered to have no policy exit or reversal. Therefore,it collects the statistical data of national innovation spaces from the Torch Center of the Ministry of Science and Technology from 2015 to 2020,and employs DID and overlapping CS-DID stable estimator ATT to examine the impact of the filing policy on the performance of the mass innovation space,clarify the incentive mechanism behind it,and conduct relevant robustness and heterogeneity analysis tests.#br#The research results indicate that the filing policy for crowd innovation spaces can significantly improve the investment and incubation performance of mass innovation spaces,but there was a weakening trend after the third year. Mechanism testing shows that the filing policy mainly achieves performance improvement through fiscal subsidies,and then through "technological innovation effects" and "factor substitution effects". Heterogeneity analysis confirms that there has been no significant difference in the impact of filing policies on investment performance among the spaces located in different regions of the east,central,and western regions. However,in terms of incubation performance,the central and eastern regions are significantly higher than the western regions. Future efforts should be made to explore more diverse policy tools such as finance,talent,and government procurement around filing policies,attract market and social forces to participate in the construction of filing innovation spaces,and create a "combination effect" of policies by facilitating the interaction of filing policies with other policy tools.#br#The innovation of this paper mainly lies in three aspects. Firstly,the study clarifies the internal transmission mechanism of the impact of filing policies on the performance of crowd innovation spaces,namely the existence of two mechanisms of "technological innovation effect" and "factor substitution effect" in crowd innovation spaces,and empirically tests the impact of filing policies on the improvement of crowd innovation space performance. Secondly,from the perspective of economic externality theory,this study explores the rationality of implementing fiscal subsidies in mass innovation spaces and finds out their positive externalities. Implementing fiscal subsidies within a reasonable range can help achieve economic Parot-optimality,which provides a theoretical reference for future research and the introduction of more public policies to support the development of maker spaces. Thirdly,in terms of research methods,the latest theoretical research methods of overlapping DID are applied to compare and analyze the bias problems caused by heterogeneity treatment effects and other related theoretical methods,providing theoretical method reference for obtaining more robust research conclusions.#br#