The white blood cells drop to 2.7×10⁹/L after chemotherapy, it is necessary to consult a doctor in time, and use leukocyte-boosting drugs under the guidance of a doctor, such as recombinant human granulocyte colony-stimulating factor and Diyu Lianbai tablets. The most common side effect of tumor chemotherapy is myelosuppression, and myelosuppression can be manifested as neutropenia, leukopenia, thrombocytopenia, hemoglobin reduction and so on. The white blood cell count of 2.7×10⁹/L is Ⅱ° myelosuppression, and it should be treated with leukocyte-boosting drugs, such as recombinant human granulocyte colony-stimulating factor and Diyu Lianbai tablets. Tumor patients try to choose fish, lean meat, milk, eggs, tofu and other protein-rich foods during chemotherapy to improve the body’s immunity, to avoid smoking and alcohol, and to ensure the intake of fresh vegetables and fruits.