This paper establishes the reaction conditions that rapeseed meal is hydrolyzed into composite ainino acids by hydrochloric acid with formuldehyde titration. The results showed that the optimum reaction conditions were as follows: reaction time 18h, reaction temperature 105~ 110℃,concentration of hydrochloric acid 6. 0 mol/L,the yield of composite amino acids can be 89. 6 %. the synthes is of N-lauroyl amino acids surfactant from composite amino acids solution obtained was studies also. The results showed t...