Abstract: According to high steam injection pressure,poor steam injection effect,high oil viscosity,low production efficient in steam huff-and-puff on Syria Oudeh carbonate reservoir,we develop a new oil driver system named XLYO-1which consists of petroleum sulfonate,alpha olefin sulfonates,polyoxyethylene ether and schiff base.The testing results show that the oil driver has multiple functions.The interface tension of oil driver can reach 10^-2 mN·m^-1 after it is disposed at 300℃,and the oil viscosity reduction can get above 90%at very low concentration of oil driver.Meanwhile,oil driver can achieve wettability reversal,and change the oil wet formation to the water wet formation.These multiple functions can reduce the steam injection pressure,and delay the steam breakthrough,and finally improve the displacement efficiency.