Trinitrophenyl ethanol (PicCH₂CH₂OH) was prepared through the reaction of TNT and formaldehyde used as starting materials under the weak base condition, and the target product acrylic 2,4,6-trinitrophenethyl ester with a yield of 62% was synthesized through the reaction of acrylic acid and PicCH₂CH₂OH under the conditions of concentrated sulfuric acid as catalyst, toluene as solvent and reflux for 24 h. The product was characterized by ¹H NMR, FTIR, UV-Vis, MS and elemental analysis. The thermal stability of the product was studied by thermogravimetric analysis (TG), and the kinetic parameters (activation energy and pre-exponential factor) for decomposition reaction were obtained by Kissinger′s method and Ozawa′s method. 