Allo-HSCT is increasingly being used for AML, however, leukemia relapse remain a main problem for decades.Recently the investigators have witnessed great progresses in cancer therapy with chimeric antigen receptors modified T cells(CAR-T), especially for B-cell malignance. preclinical data about anti-CD123 CART have shown raised serious safety concerns of human anti-CD123 CAR-T for severe impairment of normal hematopoiesis in NSG mice.Patients with AML recurred after allo-HSCT have a dismal prognosis.The investigators developed donor-derived CART to target CD123 for the treatment of AML. The investigators start the Phase I study aimed to recurred post-transplantation AML patients using donor-derived CAR-T. The purpose of this study is to assess the safety and effectiveness of anti-CD123 CAR-T cells in patients.