## 2 Literature Review and Mechanism Analysis  
Regional S&T innovation ability began with the \"Theory of Economic Development\" proposed by [PERSON]. Since [PERSON] and [PERSON] the concept of innovation at the regional level, academia has shifted the research focus from the national perspective to regional innovation [2]. The research on the impact of GPSTPS policy on regional S&T innovation ability can be traced back to the research on the effect of S&T public services on S&T innovation ability. Since the GPSTPS policy is aimed at increasing the supply of S&T public services, investigating the effect of S&T public services on S&T innovation ability can lay a foundation for the current research. Nowadays, the existing research at home and abroad mainly focuses on qualitative methods to analyze the mechanism of S&T public services on S&T innovation ability. For example, [PERSON] [3] and [PERSON] [4] believe that the appropriate content of S&T public services and correct service supply mode can accelerate the allocation of innovation resources and improve the S&T innovation ability. In addition, [PERSON] points out that the high-quality S&T public services provided by governments is beneficial to alleviating the problems of insufficient resources faced by innovation subjects in markets [5]. This conclusion also further provides a basis for the current research, which aims to explore the effect of GPSTPS on S&T innovation ability. [PERSON]'s research on the development of regional S&T innovation in Europe shows that the public services related to innovation, such as the transformation of S&T achievements, are the key factors influencing the regional S&T innovation ability [6]. [PERSON] et al. believe that Sci-Tech parks, technology research centers initiated and established by governments, effectively overcome the disadvantage of innovation ability of small and medium-sized enterprises, and effectively promote regional S&T innovation in the process of European integration [7]. At the same time, many scholars conducted a series of empirical studies on the influence of S&T public services on S&T innovation ability. For example, [PERSON] et al. construct the quality evaluation index system of S&T public services. Based on the threshold effect of absorption capacity, they analyzed the effect of S&T public services' quality on regional S&T innovation ability [8]. Taking 18 cities in Hubei Province in China as an example, [PERSON] and [PERSON] evaluate the S&T public services with the factor analysis method [9]. They point out that S&T public services are an important factor in promoting regional S&T innovation ability. In conclusion, the exploration of the relationship between S&T public services and regional S&T innovation ability can provide the theoretical and empirical support for the research on the impact of GPSTPS policy on S&T innovation ability. Government procurement is an important management system to optimize the allocation of public resources. Although there are theoretical differences between government procurement and GPPS, the connotation of the two concepts is basically the same. Therefore, this paper reviews the research on the relationship between government procurement and S&T innovation, so as to provide the references for current research. [PERSON] and [PERSON] take the procurement amount as the index to measure government procurement and explored the relationship between government procurement and innovation based on the grey correlation analysis model [10]. [PERSON] investigates the role of government procurement in promoting S&T innovation from the perspective of cointegration analysis [11]. [PERSON] constructs the evaluation model of government procurement promoting innovation and made a specific design for government procurement from the perspective of subjects, mode, system and mechanism [12]. Moreover, in view of the problems existing in the government procurement promoting S&T innovation, scholars have summarized some conclusions.