Absolute neutrophil value of 1.5×10^9g/L during chemotherapy for lung cancer is not very serious and is a common situation. The treatment plan of lung cancer is related to pathological type, clinical stage, etc. Chemotherapy is a common way to treat lung cancer, i.e. killing cancer cells by chemical drugs to achieve the therapeutic purpose. Bone marrow suppression is a common complication of chemotherapy, which can be categorized into 4 grades, among which the absolute value of neutrophils 1.9~1.5×10^9g/L belongs to grade I, which is a common phenomenon and not very serious. However, if the absolute value of neutrophils is 0.9~0.5×10^9g/L or lower than 0.5×10^9g/L, it is a more serious situation, in which the body’s defense ability to the outside world is seriously reduced, secondary infection will occur, and it will also lead to the reduction of clinical efficacy. The absolute value of neutrophil 1.5×10^9g/L during chemotherapy for lung cancer is not very serious, so patients are advised to keep a good mood, monitor blood routine regularly, and consult the doctor in time if there is any discomfort, so as to avoid delaying the condition.