Inclusion Criteria:
1. up to 75 years (Child, Adult) , either sex；
2. Bone marrow cell morphology examination showed the proportion of primitive and immature lymphocytes in the bone marrow is \>5%, or the bone marrow MRD analysis comfirmed as B-ALL.
3. Flow cytometry or histology confirmed positive expression of cluster of differentiation 19 (CD19);
4. According to the researcher's assessment, the expected survival period is greater than 3 months;
5. Eastern Cooperative Oncology Group (ECOG) physical condition score ≤ 3;
6. The patient has good liver, kidney, heart, and lung functions: alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 2.5 × upper limit of normal(ULN), which can be relaxed to ≤ 5 × ULN for patients with liver invasion; Total serum bilirubin \< 34 μ Mol/L; Creatinine clearance rate\>30 mL/min; Cardiac ejection fraction (EF) ≥ 40%, without pericardial effusion and significant arrhythmia; Indoor oxygen saturation (SpO2) ≥ 92%;
7. Peripheral blood lymphocyte absolute count: absolute lymphocyte count (ALC) ≥ 0.5E9/L, blood platelet (PLT) \> 30E9/L, Hb \> 80g/L, with a single venous access and no other contraindications for blood cell separation;
8. MRI examination showed no active malignant cells in the cerebrospinal fluid, no brain metastases, or no central nervous system leukemia;
9. Individuals with fertility must agree to the use of efficient contraceptive methods;
10. The subject or their legal guardian can understand and voluntarily sign a written informed consent form.
Exclusion Criteria:
1. Pregnant or lactating women, as well as women with pregnancy plans within six months;
2. Virological tests of hepatitis B, hepatitis C, AIDS, syphilis and cytomegalovirus were positive;
3. Having a history of other tumors (excluding skin or cervical carcinoma in situ cured by root therapy and without evidence of disease activity);
4. Previously received treatment targeting CD19;
5. Received autologous hematopoietic stem cell transplantation within 6 weeks;
6. The presence of uncontrollable active bacterial or fungal infections;
7. Allergies to research related drugs or cellular components;
8. Active autoimmune diseases exist;
9. Patients with unstable or active ulcers or gastrointestinal bleeding currently present;
10. Individuals with mental or psychological disorders who cannot cooperate with treatment and efficacy evaluation;
11. Received other experimental drug treatments within the past 3 months;
12. Existence of grade II-IV acute graft versus-host disease (GVHD) or widespread chronic GVHD;
13. Researchers believe that other reasons are not suitable for clinical trial participants.
