Great progress has been made in the treatment of relapsed and refractory B cell malignancies with CD19-targeted CAR-T cells. However, for myeloid malignancies, which has higher morbidity, trials of CAR-T is few. CD33 is expressed on most myeloid leukemia cells so it is a ideal target for CAR-T. This trial is designed and conducted to test the safety and effectiveness of CD33-targeted CAR-T.