Under the background of “dual carbon” goals, the construction industry, as a key industry for carbon emission reduction, is characterised by short cycle and intensive carbon emission during the construction phase. Taking the overnight passenger accommodation project of Changsha Huanghua International Airport reconstruction and expansion project as an example, discusses green construction of the project, including intelligent construction site management platform, BIM+4D information management, carbon emission quota calculation and analysis management system of the construction project, green building materials, 10 New Technologies in Construction Industry (2017), the promotion and application of green construction technology, as well as a number of green and low-carbon technologies innovated independently by the project, to effectively reduce carbon emission while ensuring the project quality and safety, and to effectively reduce carbon emission. technology, on the basis of ensuring the quality and safety of the project, effectively reducing carbon emissions, saving resources, protecting the environment, and achieving significant green comprehensive benefits, including economic, environmental protection, social and other significant benefits, and at the same time, strongly improve the evaluation score of three-star buildings, and provide references and reference for the same kind of green building construction and green building grade evaluation.