Adopting a spatial perspective on talent policies, this paper constructs a quantitative standard for Chinese urban talent policy, and scores 3308 talent policies in 293 prefecture-level cities. On this basis, by using spatial analysis methods, this paper characterizes the spatiotemporal differentiation and evolutionary processes of talent policies at the prefecture-level in China from 2012 to 2021. Meanwhile, this paper designs an evaluation index system for new quality productive forces in cities, and conducts a quantitative study on the relationship between urban talent policies and new quality productive forces. The results show that: (1) The comprehensive scores of talent policies exhibit a southeast-to-northwest gradient, featuring higher scores in the southeast and lower scores in the northwest. Specifically, the eastern region has maintained a high level of scores throughout, while the central region, despite starting from a lower base, has experienced rapid growth. In contrast, the western and northeastern regions have experienced relatively slower improvements. (2) Based on the analysis of urban types from the three dimensions of "policy intensity-policy objective-policy measure", it is evident that cities with simultaneous progress in all three dimensions tend to expand from the coast towards the inland. Additionally, internal polarization is prominent in the western and northeastern regions. (3) The analysis of urban types based on the three dimensions of "policy instrument-policy link- prioritized talent" reveals that the central region exhibits shortcomings in the use of safeguard policy instruments, while the western and northeastern regions lack adequate development policy instruments. The western region faces notable shortcomings in talent retention policies, while the northeastern region exhibits deficiencies in talent cultivation policies. While regions vary in their preferences for talent types, highly educated talents have universally emerged as the primary focus. (4) In practical terms, talent policies significantly enhance the development of new quality productive forces by leveraging the talent agglomeration effect, innovation-driven effect, and industrial upgrading effect, with distinct heterogeneities observed across regions and policy types. The research conclusions can provide decision-making references for local governments to formulate more practical talent policies. The marginal contributions of this paper lie in: Firstly, it innovatively designs a quantitative standard system for prefecture-level talent policies in China, encompassing three dimensions: policy intensity, policy objectives, and policy measures. This system was applied to score 3308 talent policy texts across 293 prefecture-level cities from 2002 to 2021, thereby establishing a panel database (2012-2021) of comprehensive scores and detailed indicators for China's prefecture-level talent policies. This provides comprehensive and robust data support for subsequent research. Secondly, employing spatial analysis methods, the paper systematically characterizes the spatiotemporal evolution of talent policies at the prefecture-level in China. It presents a panoramic view of their gradient distribution pattern, internal regional polarization characteristics, and the trajectory of spatial center shifts, constituting a valuable exploration into the spatial dynamics of nationwide prefecture-level talent policies. Thirdly, it constructs an evaluation index system for urban new quality productive forces and conducts a quantitative study on the relationship between talent policies and new quality productive forces. This research precisely identifies the heterogeneous effects of policies across regions, policy instruments, and policy links, offering new perspectives and evidence for understanding the spatiotemporal evolution and practical effectiveness of talent policies in Chinese cities.