Cement　asphalt　emulsion　(CA)　composites　which　integrate　the　advantages　of　both　rigidity　and　flexibility,　have　been　widely　used　as　the　key　materials　in　ballastless　slab　track,　semi-flexible　base,　cold　recycling　of　asphalt　pavement.　The　critical　properties　of　both　fresh　and　hardened　CA　paste　are　greatly　depended　on　the　interaction　between　cement　and　asphalt　emulsion,　which　is　reviewed　in　this　paper.　The　interaction　mechanisms　are　summarized　from　two　aspects:　the　adsorption　of　asphalt　emulsion　on　cement　grains　and　the　destabilization　of　asphalt　emulsion　by　cement　hydration.　The　main　influencing　factors　and　evaluation　methods　for　both　the　physical　and　chemical　adsorption　of　asphalt　emulsion,　and　interaction　with　Ca2+　are　introduced.　Meanwhile,　the　influencing　mechanisms　of　interaction　on　asphalt　emulsion　demulsification,　cement　hydration　and　rheology　of　CA　pastes　are　analyzed.　Last,　the　prospective　direction　for　research　is　also　suggested.