Clinical Study of CAR-T Cell Therapy Following ASCT for R/R B-cell Non-Hodgkin's Lymphoma

Inclusion Criteria: 1. Age: 18-65 years. 2. Pathological immunohistochemistry or flow cytometry confirmed that R/ R Large B-cell Non-Hodgkin's Lymphoma with measurable (the longest diameter greater than 1.5cm and the longest vertical diameter greater than 1.0cm) lesions. 3. Previously treated with 1 or more lines of therapy. 4. ECOG≤2#. 5. The main organ functions need to meet the following conditions:LVEF≥50%;CCr≥30 ml/min; ALT and AST≤3 times normal range. 6. Hematopoietic function needs to meet the following conditions: platelet count≥45×10\^9/L; hemoglobin≥8.0 g/dL; absolute neutrophil count≥1.0×10\^9/L. 7. Subjects of child-bearing or child-fathering potential must be willing to practice birth control from the time of enrollment on this study until the follow-up one year period of the study. 8. Estimated survival time ≥3 months. 9. Voluntary signing of informed consent and good compliance. Exclusion Criteria: 1. Have used immunosuppressants or hormones within 2 weeks prior to apheresis, or have to use immunosuppressants or hormones after signing informed consent. 2. The presence of bacterial, fungal, viral, mycoplasma or other types of infection that, in the judgment of the investigator, are difficult to control. 3. Active hepatitis B or active hepatitis C. 4. HIV infection. 5. Have received CAR-T cell therapy or allogeneic hematopoietic stem cell transplantation prior to signing the informed consent. 6. Prior malignancy (other than Relapsed Refractory B-cell Non-Hodgkin's Lymphoma). 7. Pregnant or breasting-feeding women. 8. There is evidence of complications or medical conditions that could interfere with the conduct of the study or put patients at serious risk, including but not limited to serious cardiovascular disease. 9. Conditions deemed by the researchers to be inappropriate for participation.