Various　flat　micro-heat　pipe　arrays　with　miniature　axially　grooves　for　electric　chip　cooling　are　constructed.　A　series　of　experiments　including　start-up　time,　temperature　distribution　and　heat　flux　with　different　working　fluids　and　filling　factors　are　carried　out.　The　result　shows　that　flat　micro-heat　pipe　arrays　have　advantages　of　quicker　start-up,　less　temperature　difference　and　better　heat　transfer.　R141b,　acetone,　methanol　and　ethanol　are　used　as　working　fluids.　Flat　micro-heat　pipe　arrays　filled　with　methanol　have　the　best　heat　transfer　performance.　The　maximum　heat　flux　can　reach　102　W　·　cm-2　while　the　chip　is　maintained　at　its　working　temperature,　below　70°C.　The　best　filling　factor　of　methanol　is　0.3　for　high　heat　flux.　©　All　Rights　Reserved.