A series of cation polyurethane surfactants blocked by aliphatic alcohol ether were synthesized by the polymerization reaction between 3-isocyanatomethyl-3,5,5-trimethyisocyana- te (IPDI) ?N - methyl diethanolamine (MDEA) and aliphatic alcohol ether with different long chain alkyls（AEO-2、AEO-5、AEO-9、O-2、O-5、O-10）. Their chemical structure were characterized and confirmed by FT-IR analysis. The effects of the carbon number in alcohol ether ?altyl phenol polyoxyethylene as well as additional elect rolyte on the surface tension and critical micelle concentration were researched. The results showed that when the aliphatic alcohol ather is O-5,the surfactant has excellent燾omprehensive performance, and its critical micelle concentration is 0.0379g/L with the surface tension of 34.142mN/m.