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Rheumatoid arthritis is a chronic inflammatory autoimmune disease its etiology is unknown . The classical autoimmune diseases, have adaptive immune genetic associations with autoantibodies and major histocompatibility complex(MHC) class II such as rheumatoid arthritis (RA), diabetes mellitus type two (DM II). Serum of99 males suffering from RA without DMII as group (G1), 45 males suffering from RA with DM II as group (G2) and 40 healthy males as group (G3) were enrolled in this study to estimation of alkaline phosphates (ALP),C-reactive protein(CRP) and Pentraxin-3(PTX). Results showed a highly significant increase in PTX3 levels in G1 and G2 compared to G3 and a significant decrease in G1comparing to G2. Results also revealed a significant increase in CRP levels in G1 and G2 when compared to G3 , as well as a significant increase in G2 comparing to G1. Results showed a significant decrease in ALP levels in G1 and G2 while this phrase must no differences was observed betweenG1 and G2and there was no significant positive correlation between PTX3 and ALP in sera of RA males patients with and without DM II it be showed in our study.