Internal decision.

This is an investigator-initiated trial to evaluate the safety and efficacy of universal allogeneic anti-CD19/BCMA CAR T-cells（QT-019C） in With Relapse/Refractory Autoimmune Diseases.

This is an investigator-initiated trial to evaluate the safety and efficacy of universal allogeneic anti-CD19/BCMA CAR T-cells（QT-019C） in Patients With Relapse/Refractory Autoimmune Diseases.

Study intervention consists of a single infusion of universal allogeneic CAR T-cells administered intravenously after a lymphodepleting therapy regimen consisting of cyclophosphamide.

Inclusion Criteria:

• 1. Age ≥ 18 years old (inclusive), regardless of gender. 2. Adequate hepatic, renal and bone marrow function.3 Participants with relapsed or refractory autoimmune diseases, Including SLE or IM.

Exclusion Criteria:

• 1. Participants with a history of severe drug allergies or allergic constitutions.2. Presence or suspicion of uncontrolled or treatment-required fungal, bacterial, viral, or other infections.3. Participants with insufficient cardiac function.4. Participants with congenital immunoglobulin deficiencies.5. History of malignancy within five years.