Cellular immunotherapy can kill tumor cells, inhibit tumor activity and reduce the metastasis and recurrence rate of tumor patients: ① The effective time of surgery for tumor is early, and the patient’s age and health condition should be considered. Therefore, tumor patients are often worried about recurrence after surgery; ② Chemotherapy is a chemical treatment, which is said to be a drug, but in fact, it is also a poison in another sense, which not only kills cancer cells, but also kills normal cells, so many patients cannot tolerate chemotherapy treatment, which will have serious side effects, and in serious cases, it can accelerate patients’ death. Wang Zhimin, Department of Anorectal Medicine, Shandong Qianfo Mountain Hospital ③ Radiotherapy is to eliminate lesions with rays, which is an important means to treat malignant tumors, but radiotherapy cannot reduce the toxic effect of chemotherapy, and chemotherapy cannot reduce the damaging effect of radiotherapy, such as chemotherapy inhibits bone marrow of the whole body, and radiotherapy also produces local bone marrow suppression, and patients often cannot continue treatment because of low blood phase of bone marrow suppression. When doing radiotherapy for chest tumor, the occurrence of radiation pneumonia or pulmonary fibrosis and radiation pericarditis increases significantly in patients after chemotherapy, and sometimes the dose of radiotherapy has to be reduced, which increases the difficulty of radiotherapy. The main principle is to isolate monocytes (a kind of immune cells) from peripheral blood of patients in vitro and make them have the ability to specifically kill tumors after specific antigen action and laboratory culture. In addition, the mechanism of autologous cellular immunotherapy can improve the immunity of patients, so that the survival time of patients can be greatly delayed to a certain extent. The Ark of Life program started in the early 21st century has made great progress in cellular immunotherapy in the treatment of cancer.