This　paper　aims　to　investigate　experimentally　the　heat　transfer　and　flow　characteristics　of　a　multiport　minichannel　flat　tube　(MMFT)　with　a　kind　of　axially　continuous　sawtoothed　(two-dimensional)　fin　structure.　The　experiments　using　MMFTs　with　fourteen　types　micro-fin　structures　as　test　sections　and　water　as　working　fluid　were　performed　to　study　the　effects　of　fin　structure　elements　on　heat　transfer　and　pressure　drop,　including　the　height　of　fin　(H-f),　the　bottom　width　of　fin　(W-f),　the　distance　between　two　neighboring　fins　(S-1)　and　the　number　of　fins　in　a　channel　(N).　The　friction　factor　and　Nusselt　number　of　all　samples　have　been　obtained　with　Reynolds　number　ranging　from　128　to　5645.　The　experimental　data　show　that　Nu　and　f　both　increase　with　the　increase　of　H-f　and　N-1　and　decrease　with　the　increase　of　W-f.　Moreover,　as　H-f,　W-f　and　N　remain　the　same,　Nu　has　no　obvious　change　with　the　increase　of　S-1.　More　discussions　on　effect　of　fin　have　been　performed　in　this　work.　The　performance　evaluation　criterion　(PEC)　was　calculated　to　comprehensively　assess　the　performance　of　the　MMFT　with　fins.　The　maximum　value　of　PEC　can　reach　1.95　in　the　present　study.　Finally,　based　on　experimental　data,　two　new　correlations　of　Nu　and　f　are　proposed.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.