Abstract: Silicate tris(2,3-dibromopropyl) tribromophenyl ester was synthesized from tribromophenol, silicon tetrachloride, and 2,3-dibromopropanol. The effect of charging order, solvent, reaction temperature, reaction time, and composition on the reaction yield was also discussed. The above ester was introduced into PVC and the molecular structure and property of the system were characterized by means of FTIR, 1HNMR, and limited oxygen index. It was found that the limited oxygen index of the PVC compound containing silicate tris(2,3dibromopropyl) tribromophenyl ester was 395 %,and had a good effect on antiflaming, plasticizing, charring, and antidripping.