地方政府碳排放政策体系的科学性与系统性对实现碳达峰、碳中和目标具有重要作用。本研究基于PMC指数模型构建政策评价体系，对湖南省“双碳”目标提出前后的碳排放政策进行量化评估。研究发现，湖南省碳排放政策PMC指数均值为6.81，整体处于良好水平；“双碳”目标提出后政策质量显著提升，PMC指数均值从6.12提高至7.50；湖南省碳排放政策在时效性、功能性和公开性方面表现较好，但在激励保障、作用层面和公众参与方面存在完善空间。

The scientific and systematic nature of local government carbon emission policy systems plays a crucial role in achieving the carbon peak and carbon neutrality goals. This study constructs a policy evaluation system based on the PMC index model to quantitatively assess carbon emission policies in Hunan Province before and after the introduction of the “dual carbon” goals. The findings indicate that the average PMC index for Hunan Province’s carbon emission policies is 6.81, reflecting an overall good level. After the introduction of the “dual carbon” goals, policy quality improved significantly, with the average PMC index rising from 6.12 to 7.50. The policies perform well in terms of timeliness, functionality, and transparency, but there is room for improvement in incentive mechanisms, implementation levels, and public participation.