Abstract:Colorectal cancer is the third most common cancer in the world. Both morbidity and mortality have increased in the past decade in China. Therefore, it is an urgent need for clinical treatment to reduce the incidence of patients or prolong the survival of patients. With the success of immunotherapy, more studies have confirmed that the progress of colorectal cancer is closely related to the tumor microenvironment. The mechanism by which tumors suppress anti-tumor immune responses and generate escapes is extremely complex. This review is mainly to discuss and analyze the research progress of the immune response mechanism of colorectal cancer and the immune escape.