In　this　article,　a　new　locally　denser　sinusoidal　wavy　microchannel　is　proposed　to　improve　the　uniformity　of　temperature　distribution.　The　influence　of　dense　location　and　geometrical　parameters,　that　is,　wavelength　(lambda(3)　=　600-1600　mu　m)　and　amplitude　(A(3)　=　40-200　mu　m),　waviness　factor　gamma　(0.04-0.2)　are　studied　by　numerical　simulation.　Results　show,　compared　with　rectangular　microchannels,　dense　wavy　microchannels　can　effectively　enhance　heat　transfer　with　a　larger　pressure　drop　penalty　of　53.5-152.6%,　but　only　29.6-79.9%　of　locally　denser　wavy　microchannels.　Besides,　it＇s　found　that　dense　location　influences　severe　heat　transfer　performance,　but　less　for　pressure　drops.　Heat　transfer　performance　of　downstream　dense　wavy　microchannel　is　best,　and　the　maximum　temperature　is　reduced　by　23　K　under　Re　=　348.　But　the　upstream　dense　type　increases　the　maximum　temperature　difference　than　wave　microchannel.　Under　the　same　pumping　power,　the　thermal　resistance　of　downstream　dense　wavy　microchannel　is　reduced　by　46%　and　20%　than　straight　microchannel　and　wavy　microchannels.　Decreasing　wavelength　and　increasing　wave　amplitude　could　enhance　heat　transfer,　and　the　effects　become　weaker.　But　the　pressure　drop　is　significantly　increased.　The　best　overall　thermal　performance　is　found　for　downstream　dense　wavy　microchannel　with　gamma　=　0.12　of　A(3)　=　120　mu　m　and　lambda(3)　=　1000　mu　m,　in　which　thermal　resistance　is　reduced　48.6%　under　same　pumping　power.