Based on PB-LCA method, taking typical hot summer and cold winter areas of Hunan province as an example, this paper sets up a macro-construction CO₂ footprint model at the provincial level, quantitatively measures and compares CO₂ footprints and their changes in each stage of the construction during 2004-2016, and uses geographical detector technology to analyze the influence mechanism of construction CO₂ footprint. Main conclusion is as follows. The construction CO₂ footprint was the trend of the overall fluctuating growth; building materials preparation and construction operations were the two major stages of the construction CO₂ footprint, while the CO₂ footprint of construction and construction demolition stage was relatively small; the CO₂ footprint of building materials preparation stage mainly came from steel and cement, and the CO₂ footprint of public buildings was on the rise. But the CO₂ footprint of residential buildings had a tendency of fluctuating drop. The construction development degree, energy structure and tertiary industry proportion were the three main influencing factors of construction CO 2 footprint. Thus, reducing consumption of building materials, especially steel and cement, reducing the proportion of coal consumption during construction and construction operation, and implementing limits of energy consumption and CO₂ emission on public buildings are the main technical directions of energy-saving and CO₂ reduction in construction.

PB-LCA method  /  construction CO₂ footprint  /  geographical detector technology  /  Hunan province