Precautions for radiotherapy of squamous lung cancer include: pay attention to assessing cardiopulmonary function; pay attention to rechecking blood routine, liver and kidney function; and maintain good living habits as well as nutritional status. Radiotherapy for squamous lung cancer may lead to cardiopulmonary radioactive injury, so attention should be paid to the assessment, especially in the case of dyspnea, which should be handled promptly and radiotherapy should be stopped when necessary. Radiotherapy may lead to bone marrow suppression, liver and kidney function damage, so blood test should be taken on time to assess the degree of damage and give appropriate treatment. Maintain good living habits, pay attention to rest, good sleep also helps to improve immunity and improve the tolerance of radiotherapy. Good nutritional status can help improve the quality of life and immune function, so pay attention to the intake of sufficient protein, fresh vegetables and fruits.