Large　amounts　of　air　pollutants　emitted　from　massive　coal　combustion　result　in　the　air　quality　deterioration　and　threaten　public　health　in　China.　To　improve　air　quality,　the　Chinese　government　released　the　coal　cap　policy　to　reduce　coal　consumption.　So　it　is　important　and　necessary　to　understand　the　possible　environmental　impact　and　relevant　health　benefits　from　the　coal　cap　policy.　The　purpose　of　this　paper　is　to　quantify　the　air　quality　improvement　and　to　evaluate　the　health　benefits　from　the　implementation　of　the　coal　cap　policy,　with　the　Beijing-Tianjin-Hebei　(BTH)　region　as　the　study　area.　The　results　showed　that　the　emissions　of　SO2,　NOx,　CO,　VOCs,　PM10,　and　PM2.5　could　be　reduced　by　20-40%　in　the　BTH　region　in　2020　and　all　pollutants　from　industrial　boilers　notably　decreased.　Under　the　coal　cap　policy,　the　PM2.5　concentration　in　the　whole　region　would　fall　by　11.27%,　and　the　total　economic　benefit　from　health　impacts　could　achieve　26.61　(13.29　to　39.14)　billion　RMB　(3.9　billion　USD)　in　the　BTH　region　in　2020,　accounting　for　0.43%　(0.21　to　0.63%)　of　regional　GDP　in　2013.　This　study　demonstrated　the　quantification　of　environmental　effect　and　health　benefit　from　the　coal　cap　policy,　which　could　be　used　for　the　complete　cost-benefit　analysis　and　provide　the　sufficient　support　for　policy　makers　to　implement　the　coal　cap　policy　in　the　BTH　region　and　other　areas　of　China.