Children’s white blood cells 15×10^9/L, platelets 343×10^9/L, the seriousness of the situation can not be assessed by a single indicator, it is recommended that under the guidance of a doctor to clarify the diagnosis and standardize treatment. The normal range of leukocytes in children is (5~12)×10^9/L; the normal range of platelets is (100~300)×10^9/L. At present, the two indicators are slightly higher. 1. Leukocytosis can be divided into pathologic and physiologic increase. Pathological increase includes infectious diseases, hematologic diseases (acute leukemia, etc.). Physiologic factors include strenuous exercise or dehydration. 2. Thrombocytosis in children can be categorized into primary thrombocytosis and secondary thrombocytosis, which can also be seen after infection or strenuous exercise. Specific cases should be analyzed, combined with other blood indicators, inflammation indicators and the child’s own situation, if there is no other physical discomfort, it can be observed; if there is obvious discomfort, it should be timely hospital consultation, specific diagnosis and treatment under the guidance of a physician.