Carbon dioxide (CO2) emissions from China's construction industry account for approximately half of the country's total CO2 emissions. Given the frequent trade in the construction industry among regions, it is crucial to clarify the regional responsibilities for emission reduction in order to formulate reasonable emission reduction policies. To address the CO2 emission situation and emissior reduction responsibilities of China's construction industry across different regions, a multi-regiona input-output fuzzy network linear programming method (MFEP) is proposed. This method incorporates three modules, namely input-output analysis, fuzzy processing, eco-analysis , and five types of evaluation indexes. It enables the effective calculation of CO2 transfer amounts and sheds light on the mutua utility relationship of transfers between regions, thereby elucidating the CO2 reduction responsibilities of China's construction industry between regions. The results indicate that emission reduction targets should be lowered for provinces with rather high external contributions, such as Jiangsu (5.62) and Zhejiang (6.20), while emission reduction efforts should be increased for provinces with rather high external dependence, such as Tianjin (5.61) and Hebei (6.41). Additionally, adjusting the current energy structure, which is predominantly reliant on oil, and increasing the utilization of new energy sources like natural gas , can help offset the negative impacts of CO, transfer. This research outcome serves as a scientifc reference and provides a strong basis for decision-makers in formulating emission reduction policies for the construction industry.