Based　on　the　microlayer　model　for　pool　boiling　of　pure　fluid,　a　theoretical　model　for　pool　boiling　heat　transfer　of　binary　mixture　was　presented.　In　the　model　the　influence　of　mass　transfer　on　heat　transfer　was　also　considered.　The　heat　transfer　coefficient　for　pool　boiling　of　binary　mixtures　was　predicted　theoretically.　In　this　model,　the　heat　transfer　with　boiling　was　mainly　attributed　to　the　evaporation　of　microlayers　which　were　periodically　formed　while　the　individual　bubbles　were　forming.　The　agreement　between　the　present　theoretical　model　and　the　experiment　data　is　good　in　the　entire　range　of　concentration　at　higher　heat　flux.