To explore the performance characteristics of modified emulsified asphalt mixture, Emulsified asphalt mortars with different mix ratios were designed. The effects of powder binder ratio, cement replacement rate and curing time on the viscosity characteristics of emulsified asphalt mortar were investigated. The initial strength of different mortar emulsified asphalt mixture was analyzed. And the Marshall stability of emulsified asphalt mixture under different temperature, humidity, wind force and other external environmental conditions was tested. The results show that, the larger the powder binder ratio, the higher the cement replacement rate, and the greater the viscosity of emulsified asphalt mortar. When the powder binder ratio is 1.0, the cement replacement rate should not exceed 50%, the initial Marshall stability is 3.32 kN. The higher the temperature, the smaller the humidity and the stronger the wind force, the more conducive to accelerating the demulsification of emulsified asphalt, and promoting the formation and development of emulsified asphalt mixture strength. With the extension of curing time, the greater the Marshall strength of emulsified asphalt mixture, the faster the strength development in the early stage, and then gradually slow down or even tend to be stable.