This study will assess the efficacy of multiple-dose of STSP-0601 for the treatment of bleeding episodes in hemophilia A or B patients with inhibitor

Inclusion Criteria:

1. 12 ≤age≤70 years of age.
2. Hemophilia A or B patients.
3. Peak historical inhibitor titer ≥ 5 BU and a positive inhibitor test when enrolled.
4. Establish proper venous access.
5. There were at least 3 bleeding events that required treatment occurred in the past 6 months before screening.
6. Agree to use adequate contraception to avoid pregnancy.
7. Provide signed informed consent.

Exclusion Criteria:

1. Have any coagulation disorder other than hemophilia.
2. Plan to receive prophylactic treatment of coagulation factor during the trail.
3. Patients plan to receive Emicizumab during the trial.
4. Patients received anticoagulant or antifibrinolytic therapy 7 days before the first administration or plan to receive these drugs during the trial.
5. Have a history of arterial and/or venous thrombotic events.
6. Platelet <100×109/L.
7. Hemoglobin<90g/L.
8. Severe liver or kidney disease.
9. Severe bleeding event occurred within 4 weeks before the first administration.
10. Accepted major operation or blood transfusion within 4 weeks before the first administration.
11. Have a known allergy to STSP-0601.
12. Pregnant, lactating, or blood pregnancy test positive female subjects
13. Participate in other clinical research within 4 weeks before enrollment (except for participating in prothrombin complex, FVII, FVIIa, FVIII, FIX trails).
14. Within 1 day before the first administration, FVII, FVIIa, tranexamic acid, and aminocaproic acid were used. Within 3 days before the first administration, prothrombin complex, FVIII, and FIX were used. Within 4 weeks, treatment with Emicizumab was received.
15. Patients not suitable for the trail according to the judgment of the investigators.