In　his　work,　a　porous-wall　microchannel　heat　sink　was　designed　and　fabricated,　and　the　wall　regions　were　etched　with　the　micro　pin　fin　arrangement　instead　of　solid　walls.　The　porous-wall　can　be　divided　into　three　regions:　the　densely/intermediate　densely/sparely　pin　fin　region　with　the　fin　gap　of　5　mu　m/7.5　mu　m/10　mu　m,　respectively.　Flow　boiling　tests　in　porous-wall　microchannels　were　carried　out　at　mass　fluxes　of　250-510　kg/(m(2).s)　and　heat　fluxes　of　120-720　kW/m(2).　The　effects　of　the　porous-wall　on　suppressing　the　flow　instabilities　and　manipulating　the　boiling　flow　were　studied,　and　different　boiling　flow　behaviors　of　pressure　drops　and　temperatures　as　well　as　corresponding　flow　patterns　were　measured　and　observed.　The　experimental　results　showed　that:　(1)　With　the　porous-wall　inter-connect　effect,　the　premature　ONB　(Onset　of　Nucleate　Boiling)　can　be　occurred,　the　nucleate　boiling　flow　in　whole　channel　can　be　triggered　in　less　than　2　ms,　the　boiling　flow　instability　can　be　suppressed,　and　the　duration　of　two-phase　flow　can　be　prolonged;　(2)　The　boiling　instabilities　in　porous-wall　microchannels　were　classified　into　four　flow　modes,　and　the　temporal　behaviors　of　temperatures　and　pressure　drops　corresponding　to　each　flow　instability　mode　were　observed　and　analyzed.　(3)　By　PSD　(Power　Spectral　Density)　combined　with　WT　(Wavelet　Transform)　analysis　method,　the　coupled　wall　temperature　oscillations　in　each　instability　type　were　decoupled　into　different　instability　sub-types　at　different　amplitudes　and　time-scales.　Moreover,　the　analysis　of　ms-timescale　flow　instability　induced　by　the　flow　pattern　transition　helps　to　better　understanding　the　dominant　influence　of　the　porous-wall　on　the　resulting　temperature　oscillations.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.