Ethanol-gasoline is a clean and reproducible fuel with potential of development, the key effects hydrated ethanol- gasoline blends' popularization and application is its stability. Through the test of hydrated ethanol-gasoline'cloud point change, hydrotropy of surfactant and cosolvent were investigated for hydrated ethanol-gasoline blends.The experimental results show that heterogeneous alcohols cosolvent has a better hydrotropy on ethanol- gasoline blends; Multiplex cosolvents is better than a single cosolvent, among whch the combination of isoamyl alcohol and isobutyl alcohol is the best. Emulsifier SP-80 to hydrated ethanol-gasoline has the better hydrotropy than heterogeneous alcohols cosolvent, and with the increased amount of it, the effect is more significant. Emulsifier SP-80 blends with additives isoamyl alcohol has the best effect, with the conditions: when SP-80 volume content is 1.0% and isoamyl alcohol volume content is 1.0%, ethanol and gasoline phase separation temperature dropped to -35.0 ℃.