Platelets only 1 × 10⁹ / L, is very dangerous, to do timely platelet transfusion treatment, but also to do a good job of bleeding prevention, and also for the cause of the fundamental treatment. 1. Platelets only 1 × 10⁹ / L indicates that platelets are extremely reduced, need to supplement the body’s platelet content in a timely manner, you can take the intravenous emergency platelet transfusion, can achieve rapid supplementation of platelet count, so that the number of platelets gradually return to the normal range, reduce the incidence of bleeding. 2. Platelets are only 1×10⁹/L, and etiologic treatment is needed. (1) There may be excessive platelet destruction, such as in systemic lupus erythematosus and primary immune thrombocytopenia, which need to be treated by glucocorticoids (prednisone), as well as hypersplenism, which can be treated by surgical removal of the spleen. (2) There may also be insufficient platelet production, such as acute leukemia, aplastic anemia, etc., which needs to be controlled by drugs to control the progression of the disease, such as acute myeloid leukemia to be Zorubicin, cytarabine and other drugs chemotherapy. Platelets only 1 × 10⁹ / L is very dangerous, you need to cooperate with the doctor in time to do the relevant examination, to clarify the specific causes, choose the appropriate treatment.