Abstract:【】 Chloroacetyl chloride, 1,3-propanediamine, dodecyldimethylamine as raw materials were taken as raw materials to synthesize a new multi-alkyl multiple quaternary ammonium salts Gemini surfactant Bis [2-amido-3-(dodecyldimethylammonio)propyl]- propylamine dichlorinated surfactant. The structure of the synthetic product was characterized by FTIR. Inhibition efficiencies and inhibition mechanisms of the synthetic product+SDBS, synthetic product+CeCl₃.7H₂O compound systems to aluminum alloy in hydrochloric acid solution were studied. Results indicate that, synergistic effects of two compound systems are ideal: IE(C_product:C_SDBS=10:9)= 96.8%, IE(C_product:C_CeCl3=10:9)= 95.5%. Synthetic product+SDBS plays a role in inhibition mainly by forming a dense adsorption film, while the synthetic product+ CeCl₃.7H₂O could form a complex in the solution and be adsorbed on the aluminum alloy, thus improving the inhibition effect.