The　drying　and　demulsification　of　bitumen　emulsion　largely　dominate　the　development　of　the　mechanical　properties　of　emulsion-based　mixtures.　However,　the　demulsifying　of　bitumen　emulsion　with　the　effect　of　filler　is　seldom　studied　from　the　aspect　of　drying.　The　emulsion　drying　and　film　formation　mechanism　is　employed　to　study　the　drying　process　of　filler–bitumen　emulsion　paste　with　thin　layer.　Based　on　the　drying　process,　the　demulsifying　effect　of　bitumen　emulsion　with　the　effect　of　filler　is　quantificationally　studied.　The　drying　process　of　filler–bitumen　emulsion　paste　can　be　accurately　divided　into　three　stages　by　the　gravimetric　and　electrical　methods.　The　key　parameters　of　drying　process,　including　the　particle　volume　fraction　of　the　initial　unstabilized　state,　the　continuous　film　state,　and　the　fast　coalesced　state　(crit1,　crit2　and　m),　are　calculated　to　reveal　the　drying　and　demulsification　process　of　filler–bitumen　emulsion　paste.　Results　show　that　the　addition　of　cement　mainly　reduces　the　evaporation　rate　of　the　second　stage　compared　to　limestone　powder,　especially　for　the　period　when　bitumen　emulsion　is　from　the　initial　unstabilized　state　to　the　fast　coalesced　state.　This　phenomenon　is　attributed　to　that　the　demulsifying　effect　of　bitumen　emulsion　can　reduce　the　evaporation　rate　of　filler–bitumen　emulsion　paste.　Besides,　compared　to　the　effect　of　limestone　powder,　bitumen　droplets　are　more　quickly　coalesced　with　the　effect　of　cement　when　bitumen　emulsion　is　unstable.　©　2021,　RILEM.