6~12 months after chemotherapy can take the new crown vaccine, but it depends on the specific recovery situation. Chemotherapy is the main means of cancer treatment, because the side effects of drugs will affect the patient’s blood system, digestive system, etc., resulting in decreased immunity, physical weakness, etc. Generally speaking, the new crown vaccine can be administered only after the body has basically recovered and the condition has stabilized 6~12 months after the end of chemotherapy, but it is necessary to look at the specific situation of the patient’s body. If the disease is not under control and the body is still weak, it is not recommended to receive the vaccine, otherwise it may lead to worsening of the patient’s discomfort, and also affect its preventive effect, and may even be ineffective immunization. In addition, patients who are allergic to the vaccine, are pregnant, or have other serious illnesses are also not suitable for the vaccine. Patients are advised to go to regular hospitals and decide whether the vaccine is suitable for them under the guidance of a doctor.