The　thermal　conductivity　of　tube　material　has　a　significant　effect　on　heat　transfer　coefficient　of　film　condensation　outside　horizontal　tube.　Experimental　studies　of　film　condensation　of　R404A　on　single　horizontal　two-and　three-dimensional　finned　tubes　have　been　conducted.　The　results　indicate　that　for　the　same　tube　material,　the　condensation　heat　transfer　coefficient　of　R404A　on　three-dimensional　finned　tubes　is　larger　than　on　two-dimensional　finned　tubes.　And　for　the　same　surface　structure,　the　lower　thermal　conductivity　tubes　obtain　smaller　condensation　heat　transfer　coefficient.