## 6 Conclusions
### Theoretical and Practical Implications  
According to the empirical analysis, with the aim of improving the regional S&T innovation ability, the following implications are summarized.  
(1) The top design must be enhanced, and a sound GPSTPS policy system should be constructed. Considering the role of GPSTPS policy in promoting the regional S&T innovation ability, local governments should improve the GPSTPS policy and pay attention to the quality and quantity of the policies. According to the constructed PMC index model of GPSTPS policy in the current research, governments can evaluate the local polices and optimize the GPSTPS polices based on the PMC index. Only an effective and perfect GPSTPS policy can promote the regional S&T innovation ability. For example, the GPSTPS policy system which specifies the purchase contents, purchase objects and purchase procedures should be initiated through considering the characteristics of S&T. In addition, in order to guarantee the implementation effect of GPSTPS policy, the supporting policies, such as the evaluation and supervision system, should be initiated.  
(2) Positive spatial correlation of S&T innovation ability between provinces should be fully utilized and the provincial cooperation can be strengthened. Empirical analysis shows that there is a significant spatial correlation in S&T innovation ability between provinces. Therefore, through building industrial chains, sharing S&T public services platforms and making full use of R&D platforms, provinces can cooperate with each other, so as to improve the regional S&T innovation ability.  
(3) Differentiated policies should be implemented in the eastern, central and western regions. According to the empirical results of the effect of GPSTPS policy on S&T innovation ability in the eastern, central and western region of China, local governments should adopt differentiated policies and implement targeted strategies according to local conditions to improve the S&T innovation ability. In the western region of China, due to the poor infrastructure and low supply level of S&T public services, the primary task of governments in western regions is to improve infrastructure, promote the rationalization of industrial institutions and strengthen the human capital, so as to lay a solid foundation for the implementation of GPSTPS policy. For the central region of China, governments should optimize the policy environment of GPSTPS. Nowadays, the policy terms of GPSTPS are not serious and the operability is poor. In order to maximize the effect of GPSTPS policy on regional innovation ability, local governments should specify the purchase contents, purchase objects and purchase procedures of GPSTPS. In addition, in order to implement GPSTPS policy, the evaluation and supervision system is essential. In the eastern region of China, GPSTPS policy has a significant effect on improving the regional S&T innovation ability. Therefore, local governments should further improve the GPSTPS policy and strengthen the quality of S&T public services. Policy diffusion effect of GPSTPS need to be paid attention to, so as to drive the improvement of S&T innovation ability in surrounding areas.