This is a single arm, open-label, phase Ⅰ study, to determine the safety and efficacy of CD19-TriCAR-T, an autologous tri-functional anti- CD19 chimeric antigen receptor (CAR)-positive T cell therapy, in Refractory/ Relapsed CD19 Positive Non-Hodgkin Lymphoma (NHL).

The tri-functional anti-CD19 chimeric antigen receptor contains an anti-CD19 scFv, a PD-L1 blocker, and a cytokine complex, enabling the CD19-TriCAR-T to simultaneously targeting the CD19 positive NHL cells，blocking the inhibitory PD-L1 signal and stimulating T/NK cell activation and expansion.

Inclusion Criteria:

1. All subjects must personally sign and date the consent form before initiating any study specific procedures or activities;

2. All subjects must be able to comply with all the scheduled procedures in the study;

3. Histologically or cytologically confirmed CD19 positive non-Hodgkin lymphoma;

4. At least one measurable lesion per revised IWG Response Criteria;

5. Aged 18 to 69 years;

6. Expected survival ≥12 weeks;

7. Eastern cooperative oncology group (ECOG) performance status of ≤2;

8. Systematic usage of immunosuppressive drug or corticosteroid must have been stopped for more than 4 weeks;

9. All other treatment induced adverse events must have been resolved to

   ≤grade 1;

10. Laboratory tests must fulfill the following criteria: ANC ≥ 1000/uL, HGB >70g/L, Platelet count ≥ 50,000/uL, Creatinine clearance ≤1.5 ULN, Serum ALT/AST ≤2.5 ULN, Total bilirubin ≤1.5 ULN (except in subjects with Gilbert's syndrome);

Exclusion Criteria:

1. Presence of fungal, bacterial, viral, or other infection that is uncontrolled or requiring IV antimicrobials for management. Simple UTI and uncomplicated bacterial pharyngitis are permitted if responding to active treatment;
2. Patients with symptomatic central nervous system metastasis, intracranial metastasis, and cancer cells found in cerebrospinal fluid are not recommended to participate in this study. Symptom free or post-treatment stable disease or disappearance of lesions should not be excluded. The specific selection is ultimately determined by the investigator;
3. Lactating women;
4. Active infection with hepatitis B (HBsAG positive) or hepatitis C virus (anti-HCV positive);
5. Known history of infection with HIV;
6. Subjects need systematic usage of corticosteroid;
7. Subjects need systematic usage of immunosuppressive drug;
8. Planed operation, history of other related disease, or any other related laboratory tests restrict patients for the study;
9. Other reasons the investigator think the patient may not be suitable for the study.