The invention discloses a method for modifying gasoline to solve the defect that gasoline with the benzene content of 1% to 2% by volume is difficultly treated in the prior art. The method is as follows: poor gasoline and dry gas enter a fluidized bed reactor respectively or after being mixed, and are in contact reaction with a catalyst to obtain clean gasoline; the reaction temperature is 200 to 400 DEG C, the reaction pressure is 0.2 to 2 MPa, the poor gasoline weight hourly space velocity is 0.5 to 4.0 h-1, the ethylene weight hourly space velocity in dry gas is 0.03 to 0.5 h-1, and the used catalyst is an catalyst with the active constituent of ZSM-5 or Y type molecular sieve. The application of the method in the invention can efficiently reduce the benzene content in gasoline and simultaneously efficiently uses refinery dry to be converted into valuable product.