Abstract: The pyrochemical oil displacement agent is dispensed with carbamide,catalyst,polymer and surfactant.To in- crease the stratum pressure,supplement the stratum energy, enlarge the volume propagated by steam,increase the flush- ing efficiency and enhance the output of oil well,the tech- nique is to use the synergistic effect of CO_2,the resultant of reaction and surfactant which are generated under the stra- tum condition in the chemical oil displacement system injec- ted in the stratum.The successful application of the tech- nique provides a technical approach to ameliorate the stimu- lation effect of high dense oil well and is of extensive applica- tion prospect.