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Aluminum formate (AF),a degradable and non-corrosive coagulant,was synthesized from aluminum hydroxide and formic acid.Polyamidine (PA),as a coagulation aid,was combined with AF for dye wastewater treatment.AF was characterized by XPS,FT-IR,viscosity,zeta potential,mass spectrum and XRD,and the flocculation properties of the dual-coagulation system were characterized by FT-IR and SEM.The results showed that COOH,Al2O3-Al and O2-Al bonds were formed in the AF synthesis process,and AF had a higher molecular weight and higher charge neutralization ability than PAC.The hydrolysates of AF were determined to contain Al13 Al11 and Al2,and the components of AF were confirmed to comprise a mixture including aluminum formate (C3H3AlO6) and its hydrate.When the color removal efficiency reached 100％ in jar tests,the optimized dosage of AF/PA was 18.91/0.71 mg/L,while the optimized dosage of PAC/PA was 21.19/0.91 mg/L.According to the variance analysis,the interaction between AF/PA and PAC/PA were insignificant in macroscopic view.FT-IR spectrum indicated AF captured pollutant by means of C=C=O bond,PAC captured pollutant by δ =CH,-C=C-and δ =CH.Overall,although the coagulation mechanism of AF was different from that of PAC,AF/PA showed better coagulation efficiency than PAC/PA in dye wastewater treatment.