Utilizing　catalysts　in　microcombustors　is　probably　an　excellent　practical　solution　to　stabilize　fuel　combustion　because　of　the　relatively　fast　reaction　speed.　In　the　present　work,　the　monolithic　catalyst　Pd/A(2)O(3)/Fe-Ni　with　metal　foam　as　matrix　was　used　inside　a　5　mm　in　diameter　microcombustor.　Then　the　effects　of　inlet　velocity　and　equivalent　ratio　on　catalytic　combustion　characteristics　of　methane　were　studied　experimentally.　The　results　showed　that　the　methane　and　air　mixture　with　the　stoichiometric　ratio　Phi　=　1.0　could　be　ignited　at　v　=　0.2-0.6　m/s.　The　velocity　of　premixed　mixture　had　a　great　influence　on　the　catalytic　combustion　of　methane.　The　larger　the　inlet　velocity,　the　higher　the　temperature　and　the　brighter　the　flame　were.　The　experiment　results　also　showed　that　the　equivalence　ratio　had　a　large　essential　impact　on　the　catalytic　combustion,　especially　for　the　lean　mixture　of　methane　and　air.　It　seemed　the　addition　of　the　porous　matrix　with　catalysts　could　significantly　extend　the　limits　of　stable　combustion.　In　the　detection　of　exhaust　gas,　CO　selectivity　increased　and　CO2　selectivity　decreased　with　the　equivalence　ratio.　When　Phi　was　between　0.94　and　1.0　m/s,　a　little　amount　of　hydrogen　was　produced　due　to　the　lack　of　oxygen.　The　measured　conversion　of　methane　to　CO　and　CO2　was　very　high,　usually　greater　than　99%,　which　indicated　the　excellent　performance　of　the　catalyst.