Several new bis (1

2-dicarbonyl) compounds containing benzofuran or benzothiophene ring have been synthesized and identified by elemental analysis and Infra red spectroscopy. A series of new polyphenyl-1

2

4-triazines having either benzofuran or benzothiophene in the main chain were prepared by reacting various bis (1

2-dicarbonyl) compounds with aromatic amida-zones

respectively. The resulting polymers were also characterized by IR spectroscopy and elemental analysis. All of them can form films by casting the polymer solution onglass follow-ed by curing at high temperature. These films not only possessed good mechanical properties but also good thermal stability.