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In this work series of new aromatic Polyesters were synthesized by polycondensation of various aromatic monomers di hydroxyl .this monomers containing on pyridine heterocyclic ring ,aliphatic methylene linkage and 4,4-Azo di benzoic acid (BCHPBM, BHPFM,FBHP,CPBHP) with Acids(4,4Azo di benzoic acid, phthalic acid and Maleic acid) using dibutyltine dilaurate as Catalyst .all polyesters(P.E1-P.E4)containing pyridine heterocyclic ring, aliphatic methylene linkage, and Azo group. The yield of Polyesters varies from 75-88%. All of these new aromatic polyester show very good solubility in common organic solvents, such as (pyridine, CHCl3, CH2Cl2 , NaOH, H2SO4, HNO3, acetone, benzene, DMF, DMSO, THF) without need for heating. Thermal stability of polyesters was studied using thermo gravimetric analysis (TGA). Monomers and polyesters characterized by spectrosticcopyFT-IRand1HNMR.