From the perspective of global carbon neutrality and sustainable concrete development， the basic concept and the core technical principles of low-carbon concrete in the whole life cycle were stated. Three technical approaches for low-carbon concrete，including direct carbon reduction， indirect carbon reduction and carbon sink technology， were proposed in terms of raw materials， concrete design， preparation， construction， service and recycling throughout its whole life cycle. The specific routes of carbon reduction technology under each technology pathway were analyzed. The evaluation methods and criteria for carbon emissions of concrete were reviewed. Meanwhile， the life cycle assessment of carbon emission of concrete was explained. The key research directions of low-carbon concrete in the future were proposed，focusing on the development of new cementitious materials and carbon sink technology.