Abstract:With continuous changes in dietary structure and the aging of population, colorectal cancer has become one of the most common malignant tumors with the increasing incidence in China, which leads to a heavy disease burden and serious threat to the people""s lives and health care. Early detection and treatment of precancerous lesions and conditions of colorectal cancer,especially the colorectal adenoma, helps to reduce the incidence and mortality of colorectal cancer and achieve the prevention in advance. In view of this, National Clinical Research Center for Digestive Diseases (Shanghai) together with Chinese Society of Digestive Endoscopology and other societies organized experts in gastroenterology, digestive endoscopy, gastrointestinal cancer, health management and other disciplines to initiate the formulation of the consensus. The consensus consists of the definition, prevention, screening and diagnosis, and treatment and follow‑up of precancerous lesions and conditions of colorectal cancer, which aims to provide references for the scientific management of precancerous lesions and conditions for colorectal cancer.