Adding　a　little　bit　2-ethylhexanol　additives　to　lithium　bromide-water　solution　can　enhance　the　absorption　dramatically　in　LiBr-water　chiller.　As　a　result,　COP　of　the　chiller　is　improved.　But　the　heat　transfer　is　going　bad　in　falling　film　evaporator　where　2-ethylhexanol　water　solution　is　working.　To　find　the　reasons,　this　paper　focuses　on　the　contact　angle　by　comparing　the　2-ethylhexanol　water　solution　and　deionized　water　on　the　different　metal　plates.　Experimental　results　show　that　adding　a　little　bit　2-ethylhexanol　additives　to　the　water　makes　the　contact　angle　bigger　than　no　additives.　Wettability　is　changed　to　be　lower.　Hence,　the　heat　transfer　in　the　falling　film　evaporator　is　decreased.　It　also　shows　that　40　mg·L-1　2-ethylhexanol　water　solution　on　the　zinc　coated　steel　has　the　smallest　contact　angle,　next　is　stainless　steel　and　the　copper　has　the　biggest　contact　angle.　Concentration　of　the　2-ethylhexanol　water　solution　has　no　obvious　effect　on　the　contact　angle.　©　All　Rights　Reserved.