Lung fungal infections after chemotherapy are mostly caused by secondary infections due to decreased immunity of the patient’s organism. After chemotherapy, the white blood cells in the patient’s body may be significantly reduced, the body’s immunity is reduced, resulting in lung fungal infections, the patient may have cough, fever, headache, chest tightness and other symptoms, the need for sputum smear, sputum culture + drug sensitivity test, to clarify the infecting pathogen, targeted treatment, the commonly used drugs are voriconazole, itraconazole, and so on. In addition, according to the patient’s condition for white drug treatment, if necessary, can be replaced or discontinued chemotherapy drugs; patients need to appropriate physical exercise, improve the body’s physical fitness, increase their own resistance. In conclusion, after chemotherapy chest fungal infection, patients need to follow the doctor’s instructions timely examination and treatment.