A series of aromatic poly--1, 2, 4-triazines have been prepared. Experimental results showedthat these polymers exhibited good thermally oxidative stability as determined by isothermal agingat 30℃ for 200 hours in air. After submerging the coated wire in boiling water for 240 hours nochange in electrical insulation was detected. Polymer films also showed good tensile strength (1050-1400 kg/cm2) at room temperature. Therefore aromatic poly-1, 2, 4-triazines demonstrate highperformance showing good potential for use as functional and structural resins in the environments demanding high thermal stability and hydrolytic stability.