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In this paper, an improved method for the preparation of erucyl dimethyl amidopropyl betaine (EDAB) was provided. The syn-thesis conditions were investigated. N,N-dimethyl-N'-erucyl-l,3-propylenediamine was synthesized by the reaction of erucic acid with N,N-dimethyl-l,3-propylenediamine at 170°C for 7 h, and then the intermediate was reacted with sodium chloroacetate in the mixture of methanol and water (3:7 v/v) at 60 °C. The product was obtained after 6 h. The compounds were con-firmed by IR and 'H-NMR. The properties of EDAB acid solution were also studied. The results indicated that viscosity of acid so-lution increased with decreasing hydrochloric acid concentration and was mainly controlled by surfactant concentration and tem-perature. The viscosity of an acid solution was maximum when the concentration of hydrochloric acid was at 15 wt%. [ABSTRACT FROM AUTHOR]