Alpha1 Antitrypsin (α1AT) is a glycoprotein which is synthesized in liver hepatocytes. It is an acute phase protein and its molecular weight is about 52 KD. This protein is expressed by two alleles on chromosome 14, codominantly. The most important function of this protein is the inhibition of serine proteases, therefore it is, classified in SERPIN (serine protease inhibitor) family. AAT has several alleles. These alleles are classified in normal (M1, M2, M3, M4, M5, ...), severe deficient (Z), moderate deficient (S), and null forms. Alpha1 Antitrypsin deficiency might be a risk factor for several diseases like neonatal and infantile liver disease, emphysema, asthma, arthristis rheumatic disease, glumeronephritis, and inflammatory eye disease.on the other hand, uveitis is an inflammatory eye disease. Immune system disorder, infectious disease, genetic and environmental factor might have important role in the etiology of this disease. Uveitis is divided in to anterior, posterior, panuveitis, and pars planitis forms. According to the role of immune system in uveitis and the regulation of this system by AAT, this research was designed. In this research 103 uveitis patients who referred to Zahedan Al-Zahra Ophthalmology center were investigated (from 1996 through 1998) and compared with 167 individuals without any eye or systemic disease. According to our result, in uveitis group 63 individuals had normal phenotypes (M1M2, M1M1 and M2M2), 14 M1S, 9 M2S, 10 M1Z, 3 MZ, and 4 MV phenotype. But in normal group, 160 individuals had normal phenotypes (M1M2, M1M1, and M2M2), 3 M1S, 1 M2S, and 3 M1Z phenotype. Therefore, there is a significant difference between abnormal phenotypes in patients and uveitis group (P<0.0001).