Tranexamic acid, also known as hemostatic cyclic acid, is an antifibrinolytic drug with the following clinical effects: i. Post-traumatic or post-surgical hemorrhage in prostate, urethra, lung, brain, uterus, adrenal gland, thyroid, liver and other organs rich in fibrinogen activator. B. Fibrinolytic hemorrhage caused by abortion, early placental abruption, stillbirth and amniotic fluid embolism. Preventing or alleviating bleeding after tooth extraction or oral surgery in hemophiliacs with coagulation factor VIII (Ⅷ) or coagulation factor IX (Ⅸ) deficiency. IV. Treatment of hereditary angioedema, which can reduce the number and severity of its attacks. V. Active bleeding occurring in hemophiliacs. Sixth, the treatment of chloasma also has certain efficacy. Seven, acute promyelocytic leukemia treatment process, patients appear hyperfibrinolytic manifestation of the time, need to use tranexamic acid antifibrinolytic treatment.