[Objective] The carbon emission effect on changes of the productional-living-ecological functions was determined in order to provide a reference for territorial and spatial planning meeting the "dual carbon" goals of "carbon peak" and "carbon neutrality".[Methods] The evaluation assignment method, the energy consumption method, and a geographical weighted regression model were used to determine the spatial-temporal evolution characteristics of the productional-living-ecological functions and their effects on carbon emissions in Liaoning Province from 2005 to 2020.[Results] ① The spatial distribution pattern of the productional-living-ecological functions in Liaoning Province did not change much from 2005 to 2020. Most of the areas were dominated by productional and ecological functions, the living function areas expanded significantly, and the spatial differences mainly occurred between the central urban area and the surrounding areas. ② From 2005 to 2013, the carbon emissions of counties in Liaoning Province increased rapidly, and from 2013 to 2020, the growth rate was slower but its spatial differences became more obvious. The high carbon emissions were significantly concentrated in Shenyang and Dalian cities. ③ The overall correlations between the productional-living-ecological functions and carbon emissions were strong. The spatial differences were obvious and the influencing factors were complex.[Conclusion] Under the constraints of natural conditions and guided by their social and economic development needs, counties in Liaoning Province need to clearly define the main functions of the land and promote regional cooperation on the basis of their own advantages and resource endowments so as to realize carbon emission reductions over the entire region.