The phenolic emulsifiers used in emulsified asphalt of micro-surfacing, which was the most important tools in the road maintenance, were investigated by control technology. Many factors influencing this reaction were studied and three kinds of phenolic emulsifiers were prepared without catalyst in ethanol. The performance was researched that 2-({2-[2-(2-Amino-ethylamino)-ethylamino]–ethyl-amino}-methyl)-4-nonyl-phenol(abbreviated as TETA) could be used in micro-surface. With addition of 0.5 % demulsifier, the mixing time was extended to 120 seconds obviously, and the cohesion torque(60 min) was 2.8 N*m, which satisfied the opening traffic time shorter than 1 h. The wet track abrasion(6 d) was lower than 807 g/m2, with interfacial modifier added, but the load wheel was increased with interfacial modifier increasing. When the TETA: demulsifier: interfacial modifier =3:1:3, excellent performance was obtained and the experimental results met the International Slurry Surfacing Association(ISSA) standard. The synthesis process of this emulsifier is simple and the performance used in micro-surface was excellent, so this kind of emulsifier could have a better application future. The phenolic emulsifiers used in emulsified asphalt of micro-surfacing, which was the most important tools in the road maintenance, were investigated by control technology. Many factors influencing this reaction were studied and three kinds of phenolic emulsifiers were prepared without catalyst in ethanol. performance was researched that 2 - ({2- [2- (2-Amino-ethylamino) -ethylamino] -ethyl- amino} -methyl) -4-nonyl- The wet track abrasion (6 d) was accelerated for 120 seconds obviously, and the cohesion torque (60 min) was 2.8 N * m, which satisfied the opening traffic time shorter than 1 h was lower than 807 g / m2, with interfacial modifier added, but the load wheel was increased with interfacial modifier increasing. When the TETA: demulsifier: interfacial modifier = 3: 1: 3, excellent performance was obtained and the experimental results met the International Slurry Surfacing Association (ISSA) standard. The synthesis process of this emulsifier is simple and the performance used in micro-surface was excellent, so this kind of emulsifier could have a better application future.