Abstract: Against the backdrop of the ‘dual carbon' goals, systematic research on carbon governance mechanisms for government-invested projects from the perspective of policy operation remains insufficient. Taking 51 government-invested construction projects in Nanshan District, Shenzhen City, Guangdong Province as the research sample, this paper adopts a combined method of policy text analysis and case-based empirical study, and constructs a whole-process carbon emission management framework integrating an indicator system, a tool system, an inspection system and an incentive system. The research reveals the key mechanisms for the closed-loop operation of carbon management and control systems, and verifies the effectiveness of this framework in promoting the implementation of low-carbon policies through practical data, thus providing institutional design references for urban low-carbon governance.