In leukemia, white blood cells can be increased, normal or decreased. A white blood cell count of (4~10)×10^9/L is considered normal, but it is incomplete to judge from the value alone. Blood count is not a diagnostic criterion for leukemia, and it is necessary to consult a doctor in time for a comprehensive evaluation of the various tests conducted by the doctor. 1. Most of the leukemia can be seen as an increase in the number of white blood cells, the increased white blood cells are immature dysfunctional naïve cells, in fact, the number of mature white blood cells in the normal state is decreasing. 2. Whether the white blood cells of leukemia are in the normal value, not only need to look at the number of white blood cells on the test sheet, but also look at the number of naive cells in the peripheral blood and the proportion of normal test results. If the number of white blood cells is high or low, please consult a doctor in time for standardized treatment. Leukemia is a long and slow process of treatment, and we hope that patients and their families can have patience and confidence.