CAR-T cell therapy targeting CD19 has been shown to be effective in heavily-pretreated B-cell ALL or NHL, but relapses post-CAR-T are common, and CD19 antigen loss is one of the reasons. Thus, we supposed that CD19/CD22 bispecific CAR-T cell therapy would be more effective and less relapses would occur in B-ALL or NHL. In this prospective phase 2 clinical trial, we aim to explore the efficacy and safety of CD19/CD22 bispecific CAR-T cell therapy in relapsed/refractory B-ALL or Large B cell lymphoma.

Inclusion Criteria:

• 14 years to 85 years, expected survival > 3 months;
• CD19/CD22 positive B-cell lymphoma or B-ALL;
• relapsed or refractory to standard first-line treatment;
• ECOG-PS score=0-2;
• Having at least one measurable lesions;
• Cardiac function: 1-2 levels;
• Liver: TBIL≤3ULN，AST ≤2.5ULN，ALT ≤2.5ULN;
• kidney: Cr≤1.25ULN;
• bone marrow: WBC ≥ 3.0×10e9/L, Hb ≥80 g/L, PLT ≥ 50×10e9/L;
• No serious allergic constitution;
• No other serious diseases that conflicts with the clinical program;
• No other cancer history;
• No serious mental disorder;
• Informed consent is signed by a subject or his lineal relation.

Exclusion Criteria:

• Pregnant or lactating women; (female participants of reproductive potential must have a negative serum or urine pregnancy test);
• Uncontrolled active infection, HIV infection, syphilis serology reaction positive;
• Active hepatitis B or hepatitis C infection;
• Recent or current use of glucocorticoid or other immunosuppressor;
• With severe cardiac, liver, renal insufficiency, diabetes and other diseases;
• Participate in other clinical research in the past three months;
• previously treatment with any gene therapy products;
• Researchers think of that does not fit to participate in the study, or other cases that affect the clinical trial results.