［Purposes ］ The influence of the interaction between geopolymer and asphalt emulsion on the mix proportion design and road performance of the mixture was analyzed to provide a reference for improving the performance of the cold recycled mixture.［Methods］ Firstly，the response surface methodology was adopted to design the mix proportion of the geopolymer -asphalt emulsion cold recycled mixture.The contents of fly ash/slag，alkali activator，and asphalt emulsion were taken as the main factors，while the 28-day splitting tensile strength and 28-day failure tensile strain of the cold recycled mixture were taken as the response variables.A 3D model was comprehensively simulated，and the response surface analysis was conducted.Then，the influence of the interaction between the geopolymer and the asphalt emulsion on the high -temperature stability，low-temperature crack resistance，and water stability of the cold recycled mixture was studied.［Results］ The three factors，namely the contents of fly ash/slag，alkali activator，and asphalt emulsion，show significant interactive effects on the 28-day splitting tensile strength and 28-day failure tensile strain of the mixture.Based on the response surface analysis and economic applicability，the suitable content is determined to be 4% geopolymer and 4% asphalt emulsion.Compared with the mixtures containing only geopolymer or asphalt emulsion，the geopolymer -asphalt emulsion composite cold recycled mixture exhibits intermediate performance in high -temperature stability，low-temperature tensile strength，and water stability，while demonstrating the maximum low -temperature crack resistance strength.Overall，the high -temperature stability and water stability of the cold recycled mixture decrease with the increase of the asphalt emulsion proportion，while the low -temperature crack resistance improves with the increase of the asphalt emulsion proportion.［Conclusions ］ The performance of the geopolymer -asphalt emulsion composite cold recycled mixture combines the characteristics of flexible mixtures and semi -rigid mixtures.A significant interaction exists between the geopolymer and the asphalt emulsion，and the mixture has the potential for application in asphalt pavement structures under an appropriate composition.