The New Crown vaccine is not recommended for patients with malignant tumors during treatment. The New Crown vaccine works by injecting inactivated virus into the body to induce the body’s immune system to produce antibodies. Patients with malignant tumors usually undergo chemotherapy, and chemotherapeutic drugs will kill normal tissue cells and immune cells in the body while killing cancer cells, resulting in low immune function and insufficient autoantibodies in patients. The immune response and protective effect of vaccination for such patients may be reduced, and adverse reactions may also occur easily. If one is in the recovery period of tumor, with stable disease control, just needing regular review and dynamic observation of physical condition, and no other contraindications to vaccination, such as fever, epilepsy, etc., one can consider vaccination with New Crown vaccine at this time. Before vaccination with the new crown vaccine, you should learn about the new crown vaccine and the vaccination process in advance. Do personal protection according to local prevention and control requirements, cooperate with vaccination staff inquiries, and provide personal information truthfully. Stay for 30 minutes after vaccination to keep the local skin clean and avoid scratching the vaccination site with your hands. In case of suspected adverse reactions, report to the vaccination unit immediately and medical personnel will handle the case.