The invention provides a method for improving stability of gasoline, wherein the gasoline is firstly mixed with reagent, under the condition of the temperature of 60 to 200 DEG C, the reaction pressure of 0 to 10.0MPa based on gage pressure and the weight space velocity of 0.05 to 50h <-1>, the mixture contacts and reacts with molecular sieve catalyst, the reagent is a mixture which comprises one or more than one compound from the compound with CH2=CHCOOR<1> general formula, the compound with R<2>CH=CHCOR<3> general formula, the maleic acid and the maleic anhydride, wherein the R<1> is the alkyl with 1 to 4 carbon atoms, the R<2> is H or the alkyl with 1 to 7 carbon atoms, and the R<3> is H, or OH or the alkoxyl with 1 to 4 carbon atoms; by the volume percent, the percent of the add-on of the reagent against the gasoline is 0.01 to 10 percent. By the invention, the dialkene in the gasoline can be completely converted to the macro molecule oxygen compound, thereby obviously lengthening the induction period of gasoline products and improving the stability of gasoline.