The liver is the most common anatomical site for hematogenous metastases of colorectal cancer, and colorectal liver metastasis is one of the most difficult and challenging situations in the treatment of colorectal cancer. In order to improve the diagnosis and comprehensive treatment in China, the Guidelines have been edited and revised for several times since 2008, including the overall evaluation, personalized treatment goals and comprehensive treatments, to prevent the occurrence of liver metastases, improve the resection rate of liver metastases and survival. The revised Guideline version 2020 includes the diagnosis and follow-up, prevention, multidisciplinary team (MDT), surgery and local ablative treatment, neoadjuvant and adjuvant therapy, and comprehensive treatment, with state-of-the-art experience and findings, detailed content, and strong operability.