目的研究干燥综合征（Ｓｊｏｇｒｅｎ′ｓｓｙｎｄｒｏｍｅ，ＳＳ）的发病机理及病因，为ＳＳ的治疗提供理论依据。方法采用卵白素－生物素过氧化酶复合物技术（ａｖｉｄｉｎ－ｂｉｏｔｉｎ－ｐｅｒｏｘｉｄａｓｅｃｏｍｐｌｅｘｔｅｃｈｎｉｑｕｅ，ＡＢＣ）对２０例ＳＳ的唇腺中浸润的淋巴细胞进行分析。结果ＳＳ唇腺浸润淋巴细胞中以Ｔ细胞为主。而在Ｔ细胞中，辅助Ｔ细胞（ＣＤ４）增多，抑制Ｔ细胞（ＣＤ８）明显减少，ＣＤ＋４／ＣＤ＋８比值明显高于正常对照组。结论ＳＳ外分泌腺免疫功能亢进是导致本病的直接原因，进一步证实ＳＳ是自身免疫性疾病。 Objective To study the pathogenesis and etiology of Sjogren’s Syndrome (SS) and provide a theoretical basis for the treatment of SS. Methods Twenty infiltrating lymphocytes from the labial gland of SS were analyzed by avidin-biotin-peroxidase complex technique (ABC). Results T-cell predominance was found in SS-gland infiltrating lymphocytes. In T cells, there was an increase in the number of helper T cells (CD4), a significant decrease in T cells (CD8), and a higher ratio of CD + 4 / CD + 8 than in normal controls. Conclusion SS exocrine immune function is the direct cause of this disease, and further confirmed that SS is an autoimmune disease.