The emulsified asphalt used for slurry seal is a slow-cracking one. The common cationic emulsified asphalts are usually of medium cracking of fast cracking types. The nonionic emulsified asphalt is mainly slow cracking type. Two asphalt emulsifiers are compounded. Combined with the advantages of two emulsified asphalts, the compound emulsified asphalt is prepared. The compounding of cationic asphalt emulsifier and the different nonionic asphalt emulsifiers is mainly summarized. The performance experiment of emulsified asphalt is carried out for whether or not suitable for the slurry seal.