Objective:To analyze the changes of the complementarity-determining region 3(CDR3) of T-cell receptor (TCR) beta chain variable region (TCR BV) in peripheral blood mononuclear cells (PBMCs) of patients with pemphigus vulgaris (PV), so as to understand the association of proliferated T cells with autoimmune diseases.Methods: Immunoscope spectratyping technique was used to analyze the distribution of TCR β chain CDR3 in 6 normal blood donors and the dominant CDR3 in the PBMCs in 6 PV patients. Results: The spectratypes of TCR BV subfamily CDR3 region was in a Gaussian distribution manner in all the 6 normal blood donors. The 6 PV patients, however, displayed abnormal proliferation, and oligoclonal expansion of the T cells was observed in TCR BV families with different CDR3 sequences. Conclusion: The abnormal spectratypes of TCR BV subfamily CDR3 region in the peripheral blood of PV patients might be related to the pathogenesis of PV.