A high temperature polyester (polyglyceryl triacrylate) have been synhesised by the esterfication of glycerol and acrylic acid followed by addition polymerization of glyceryl triacrylate in presence of benzoyl peroxide. The polyster Is thermoest, solid very hard comence of ester linkage. Differential scanning calorimeter show that the polyester is thermally stable upto 350?C A tentaive structure of the polymer is proposed.