Bowel perforation of rectal cancer can be ranging from stage II to IV in TNM staging, which also needs to be judged with lymph node metastasis and distant metastasis. Rectal cancer is a malignant tumor caused by heredity, gene mutation and other factors. It can be divided into four stages according to the primary tumor condition, the degree of lymph node metastasis, and whether distant metastasis occurs, i.e. TNM stage. Among them, the occurrence of intestinal perforation represents the T4 stage, and the specific TNM staging also needs to be combined with the other two judgment criteria. For example, T4N0M0 is stage II, which means that the tumor penetrates the intestinal wall; there is no lymph node metastasis; there is no distant metastasis.T4N1M0 and so on is stage III, which means that the tumor penetrates the intestinal wall; there is 1-3 regional lymph node metastasis; there is no distant metastasis.TXNXM1 is stage IV, which means that distant metastasis occurs irrespective of the primary tumor and lymph node situation. When perforation of rectal cancer occurs, it is necessary to actively consult the doctor and follow the doctor’s instructions for reasonable treatment.