Colorectal cancer is a common malignant tumor of gastrointestinal tract. According to the clinical manifestations and evolution of colorectal cancer in different stages, there are a lot of records similar to the description of this disease in Chinese medical literature, the contents are scattered in the titles of “intestinal wind”, “intestinal mushroom”, “intestinal dysentery”, “intestinal knot” and so on. The content is scattered in the articles of “Intestinal Wind”, “Intestinal Mushroom”, “Locked Anus Hemorrhoid”, “Accumulation”, “Dysentery” and “Intestinal Knot”, etc., which have accumulated rich experience. As an important part of the comprehensive treatment system of colorectal cancer, TCM therapy is widely used in all stages of colorectal cancer, and its efficacy has been recognized by the academic community. According to Chinese medicine, the main causes of colorectal cancer are weakness, deficiency of spleen and kidney, dietary factors, uncontrolled living and depression. The combination of internal and external factors can damage the spleen and stomach, resulting in the lack of biochemical source of qi and blood, deficiency of positive qi, and the attack of evil qi in the colon, blocking the qi flow, poor blood flow, phlegm, stagnation and toxicity, resulting in tumor formation. The pathological mechanism is characterized by the deficiency of positive and evil, with positive deficiency being the root and evil being the symptom. Identification and treatment is the key link in the treatment of colorectal cancer in TCM, which directly affects the clinical efficacy. Most of the evidence in TCM is based on symptoms, signs, tongue, moss, pulse and other vague parameters, and there are many different types of clinical evidence, including spleen deficiency, qi and blood deficiency, qi and yin deficiency, spleen deficiency and dampness, intestinal obstruction, spleen and stomach deficiency and cold, dampness and heat, qi stagnation and blood stasis, spleen and kidney yang deficiency, liver and kidney yin deficiency, qi deficiency and blood stasis, etc. Although there are many types of evidence, “spleen deficiency” accounts for 76.8% of the evidence. “This is because colorectal cancer is a disease of digestive system. According to the theory of Chinese medicine, the main function of spleen is to transport water and grain essence, which basically covers the digestive function, so colorectal cancer is blamed on spleen deficiency in accordance with the theory of Chinese medicine and Western medicine. Spleen deficiency is not only an important reason for the occurrence of colorectal cancer, but also a major pathophysiological change in the process of occurrence, development and treatment of colorectal cancer. When radical resection is performed for colorectal cancer, a considerable length of intestinal canal is removed, which will certainly cause certain damage to the digestive and absorption functions of the intestinal tract and immune defense function of the body, and the so-called “deficiency is caused by taking away the essence”. In addition, surgical treatment may cause or aggravate spleen deficiency, manifesting as weakness, fatigue, loose stools, dullness, abdominal distension, etc. The biochemical source is lacking, and the natural source is insufficient. ”If it is not corrected in time, the function of transporting water and grain essence will be abnormal, and the clear yang will not rise and the cloudy yin will not fall, so that the evil will accumulate in the intestine and become cancerous, resulting in recurrence or metastasis of colon cancer. Although the treatment rules and prescriptions of Chinese medicine against colorectal cancer vary according to different symptoms, most of them take strengthening spleen and benefiting qi as the basic treatment rule, and those with spleen deficiency are mainly treated with strengthening spleen and benefiting qi, while those without obvious spleen deficiency are often treated with strengthening spleen and benefiting qi.