Parental　emotion　regulation　is　closely　associated　with　the　development　of　young　children＇s　behavioral　problems.　The　present　study　aims　to　investigate　the　potential　mediating　role　of　family　emotional　expressiveness　in　the　association　between　parental　emotion　dysregulation　and　externalizing　problems　among　Chinese　preschoolers　and　to　further　examine　whether　this　mediation　depends　on　parental　endorsement　of　the　cultural　value　of　Chinese　familism.　A　survey　study　was　conducted　to　examine　the　moderated　mediation　model.　A　total　of　161　parents　of　preschoolers　(aged　3-5　years,　M　=　4.24,　SD　=　0.60　at　T1)　participated　in　all　three　waves　of　assessment.　The　results　showed　that　parental　emotion　dysregulation　indirectly　predicted　preschoolers＇　externalizing　problems　through　family　negative　expressiveness　for　parents　with　low　endorsement　of　familism,　whereas　the　mediating　effect　was　not　significant　for　parents　with　high　endorsement　of　familism.　The　results　contribute　to　the　literature　on　emotional　parenting　in　the　Chinese　cultural　context　and　underscore　the　role　of　familism　values　in　the　relationship　between　emotional　parenting　factors　and　children＇s　behavioral　problems.