⁃ Age 18 \

• 70 years old (including boundary value), regardless of gender;

⁃ Acute myeloid leukemia with FLT3 positive (positive rate ≥ 30%) verified by flow cytometry or immunohistochemistry;

⁃ The expected survival time was more than 12 weeks;

⁃ ECoG score 0-2;

⁃ Refractory or relapse after standardized treatment;

⁃ Liver and kidney function and cardiopulmonary function meet the following requirements:

∙ Creatinine ≤ 1.5 ULN;

‣ Left ventricular ejection fraction ≥ 45%;

‣ Blood oxygen saturation \> 91%;

‣ Total bilirubin ≤ 1.5 × ULN； ALT and AST ≤ 2.5 × ULN；

⁃ Understand the test and have signed the informed consent form.