The blood routine of aplastic anemia shows a decrease in whole blood cells, a decrease in reticulocytes, and an increase in the proportion of lymphocytes. 1. The blood routine examination of aplastic anemia is mainly characterized by the decrease of whole blood cells and the decrease of the absolute value of reticulocytes, but the degree and sequence of the decrease of red blood cells, white blood cells and platelets are different in each case. (1) Most of the anemia is normocytic, and a few are mildly or moderately macrocytic. (2) The absolute value of reticulocytes is significantly reduced, and polychromatic and nucleated erythrocytes can also be seen in blood smears. (3) The total number of leukocytes is reduced and all types of leukocytes are reduced, especially neutrophils are reduced significantly, and the proportion of lymphocytes is relatively increased. (4) Reduced number of platelets, reduced size and granularity, and reduced function. 2. In acute aplastic anemia, hemoglobin decreases rapidly; in chronic aplastic anemia, hemoglobin decreases slowly, and the number of reticulocytes, leukocytes and platelets decreases, but it is often higher than that of acute aplastic anemia. If abnormal blood test results occur, it is recommended to consult a doctor in a timely manner to clarify the cause of the disease with the help of a doctor and carry out targeted treatment or therapy.