Crop　residue　open　burning　(CROB)　is　an　important　emission　source　in　China.　Hebei　is　a　major　agricultural　province,　and　it　is　of　great　significance　to　study　its　emission　characteristics　and　impacts　on　the　air　quality　of　the　Beijing-Tianjin-Hebei　(BTH)　region.　Based　on　the　bottom-up　method,　the　high　temporal　(day)　and　spatial　(1　km×1　km)　emission　inventory　of　CROB　in　Hebei　was　developed　in　2014,　and　the　spatial-temporal　characteristics　were　further　analyzed.　Furthermore,　based　on　the　emission　inventory,　fire　spots　data　and　WRF-CAMx-PSAT　model,　the　impacts　of　CROB　emissions　on　the　air　quality　of　BTH　region　was　studied　and　analyzed　of　June　and　October.　Results　show　that　the　emissions　of　SO2,　NOx,　PM10,　PM2.5,　NMVOC,　NH3,　CO,　EC,　OC,　CO2　and　CH4　from　CROB　in　Hebei　in　2014　were　0.3×104,　1.9×104,　5.1×104,　5.0×104,　4.6×104,　0.3×104,　27.3×104,　0.2×104,　2.1×104,　685.3×104　and　2.0×104　t,　respectively.　Corn　and　wheat　were　primary　contributors　to　the　emission,　and　the　emission　fraction　was　46.6%-71.4%　and　20.5%-47.8%,　respectively.　Two　monthly　emission　peaks　were　found　in　June　and　October,　and　the　emission　in　June　was　the　highest　among　all　the　year,　accounting　for　26.9%　of　the　total　emission.　Daily　emissions　fluctuated　greatly,　and　the　top　value　happened　in　the　end　of　June　(0.3×104　t)　and　early　November　(0.2×104　t).　In　June　and　October,　the　average　contribution　ratios　of　CROB　emissions　to　atmospheric　PM2.5,　EC,　SO2　and　NO2　concentrations　in　the　BTH　region　were　4.2%　and　5.5%,　2.6%　and　2.8%,　0.4%　and　0.5%,　and　2.5%　and　1.9%,　respectively.　Except　NO2,　the　contribution　ratios　of　other　pollutants　in　October　were　all　higher　than　those　in　June.　Affected　by　the　characteristics　of　straw　burning,　the　daily-scale　contribution　showed　obvious　fluctuation　characteristics.　The　highest　contributions　from　the　emission　of　CROB　in　Hebei　to　the　daily　PM2.5　concentration　of　Beijing,　Tianjin　and　Hebei　can　reach　25.7%,　23.1%　and　21.0%,　respectively.　©　2022,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.