Jaktinib and Azacitidine In Treating Patients With MDS With MF or MDS/MPN With MF.

Inclusion Criteria: * Subjects voluntarily sign the informed consent form (ICF); * Age ≥ 18 years, either male or female; * Eastern Cooperative Oncology Group (ECOG) performance status 0-2; * Expected life expectancy is greater than 24 weeks; * Diagnosis of myelodysplastic syndrome/myeloproliferative neoplasm (MDS/MPN) according to World Health Organization (WHO)； * The patients understands the purpose of and procedures required for the study and is willing to participate in the study； Exclusion Criteria: * Subjects with congestive heart failure, uncontrolled or unstable angina or myocardial infarction,cerebrovascular accident, or pulmonary embolism within 6 months prior to screening; * Subjects suffering from arrhythmia and requiring treatment, or QTcB \> 480ms at screening; * Subjects with clinical symptoms of active bacterial, viral, parasitic or fungal infections requiring treatment at screening; * Subjects with known human immunodeficiency virus (HIV), known active infectious Hepatitis B (HepB), and/or known active infectious Hepatitis C (HepC); * Female subjects who are pregnant, currently breastfeeding, planning to become pregnant; * Subjects who had experienced malignant tumors (except for adequately treated local basal cell or squamous cell carcinoma of the skin and cervical carcinoma in situ that have been cured) within the past 5 years; * Subjects who have any other conditions that are not specified in the protocol but the investigator believes that they are not suitable for inclusion in this trial.