Abstract: p-chlorobenzyl phosphate was synthesized from trimethyl phosphite and 4-chlorobenzyle chloride by Arbuzov rearrangement reaction.The influence of reaction temperature,the molar ratio of trimethyl phosphite to 4-chlorobenzyl chloride,reaction time and feeding mode on the yield of p-chlorobenzyl phosphate was investigated.The result showed that the yield of p-chlorobenzyl phosphate reaches 90.8% when the molar ratio of trimethyl phosphite to 4-chlorobenzyle chloride is 1.2,reacting at 162℃ for 6 hours.