Platelets of only 2×10⁹/L requires immediate hospitalization and platelet transfusion, as well as identification of the cause of the disease and re-treatment according to the disease suffered. 1. The normal range of platelets is (100~300)×10⁹/L. Platelets of 2×10⁹/L belongs to very serious thrombocytopenia, which can easily lead to spontaneous bleeding and requires platelet transfusion as soon as possible. 2. The most common causes of very low platelets include primary immune thrombocytopenia, aplastic anemia and acute leukemia. It is necessary to treat the cause of the disease, such as primary immune thrombocytopenia, need to apply glucocorticoid treatment, can take oral prednisone acetate or dexamethasone. It is recommended to avoid trauma, reduce activities, do not eat too hard and too hot food, so as not to damage the digestive tract and cause bleeding. You need to go to a regular medical institution as soon as possible to seek medical help for a comprehensive analysis, so as not to delay the condition. The above medications should be used under medical supervision.