Effects　of　n-octanol　and　Al2O3　nanofluid　on　water　vapor　absorption　rate　are　investigated.　Mechanisms　of　mass　transfer　enhancement　of　adding　alcohol　additives　and　nanoparticles　are　analyzed.　Concentration　of　lithium　bromide　aqueous　solution　is　10%-55%,　adding　amount　of　n-octanol　is　0-2000　ppm,　size　of　Al2O3　nanoparticle　is　20nm,　and　concentration　of　nanoparticle　is　0-8　wt%.　Concentration　of　gum　Arabic　powder　as　dispersant　is　2　wt%.Experimental　results　show　that　n-octanol　can　improve　the　water　vapor　absorption　rate　effectively.　The　maximal　averaged　water　vapor　absorption　rate　locates　in　range　from　200　ppm　to　500　ppm　n-octanol　for　absorption　time　is　5　min　and　200　to　2000　ppm　for　1min.　Averaged　absorption　rate　of　LiBr　solution　containing　n-octanol　and　nanoparticles　is　bigger　than　that　of　solution　containing　n-octanol　only.　The　maximum　of　averaged　absorption　rate　appears　when　concentration　of　Al2O3　nanoparticles　is　3wt%.　Visualization　experiments　show　that　a　small　amount　of　n-octanol　can　induce　Marangoni　convection　at　absorption　interface.　Adding　n-octanol　and　Al2O3　nanoparticles　simultaneously　can　also　observe　Marangoni　convection.　Both　Brownian　movement　of　nanoparticles　and　Marangoni　convection　intensify　mass　transfer　when　adding　Al2O3　nanoparticles　and　n-octanol　together.　©　ACRA　2018　-　9th　Asian　Conference　on　Refrigeration　and　Air-Conditioning.　All　rights　reserved.