Abstract: Lauryl polyoxyethylene ether carboxylate with narrow molecular weight distribution (AEC) was synthesized by using AEO2 with narrow molecular weight distribution as a starting material and the optimized reaction conditions were shown as follows: n (fatty alcohol ether): n (sodium chloroacetate): n (sodium hydroxide) =1:1.1:2.2, the reactive temperature 70℃, and the reactive time 5h. The structure of the product was identified by IR and the anion active contents was determined. The properties of the product such as surface activity, foaming, wetting, emulsifying, washing properties and calcium soap dispersion were measured. The results showed that anion active content of AEC is 87.38%, CMC of the product is 0.41 mmol/L, and CMC is 25.4 mN/m, and the foaming hight is 83 ml, wetting properties is 5.1s, emulsifying abilities is 131.8s, LSDP is 16, the washing properties is 47.2%.