Four kinds of corrosion inhibitors, N,N'-bis[4,6-bis(2-aminoacetoxy)-1,3,5-triazinyl]-hexanediamine (TFYJ), N,N'-bis[4,6-bis (3-aminopropionyl)-1,3,5-triazinyl)]-hexanediamine (TFBJ), N,N'-bis[4,6-bis(4-aminobutyryl)-1 ,3,5-triazinyl)]-hexanediamine (TFDJ), N,N'-bis[4,6-bis(6-aminocaproic acid)-1,3,5-triazinyl)] -Hexylenediamine (TFJJ),was designed and synthesized by cyanuric chloride、amino acid(2-aminoacetic acid、3-aminopropionic acid、4-aminobutyric acid、6-aminocaproic acid)、1,6-hexanediamine. Its structure was characterized by FT-IR、1H NMR and MS. The corrosion inhibition of 45# carbon steel in 1 mol/L HCl was tested by weight loss method,electrochemical method and the corrosion inhibition mechanism was ananlyzed. The results showed that four types of target corrosion inhibitor had excellent corrsion inhibition effect on 45# carbon steel in 1 mol/L HCl. Preferably,the corrosion inhibition rate of TFJJ(100 mg/L)at 20 ℃ could reach 98.37 %(weight loss method). The Tafel curve showed that it was a mixed corrosion inhibitor,dominated by cathodes. The adsorption thermodynamics showed that TFJJ conformed to the Langmuir isotherm adsorption equation, and the adsorption process was mainly chemical adsorption. EHOMO, ELUMO, Fukui index, etc. of TFJJ were obtained by quantitative calculation, which proved that the corrosion inhibition of TFJJ occured on the N atom of the triazine ring and amino group, and the C and O atoms of the carboxylic acid group. Compared with the commercially available NUEF485, the corrosion inhibition rate of the product synthesized in this paper is increased by 5.25 %~9.44 %, and it still had good hard water resistance under 600 mg/L hard water.