With　the　purpose　of　suppressing　multipactor　discharges　in　spacecraft,　a　kind　of　micro-trap　structure　is　proposed　to　reduce　hold　secondary　electron　emission　from　the　sample　surface.　After　etching　structure　on　the　surface　and　spurting　metals　on　its　structure　surface,　samples　with　micro-trap　structure　on　its　surface　are　obtained　and　tested　their　secondary　electron　emission　characteristics　in　a　testing　platform　(20~4　000　eV).　In　addition,　a　numerical　simulation　model　is　built　with　dividing　the　emitted　electron　into　the　elastic　backscattering　electrons,　the　inelastic　backscattering　electrons　and　the　true　secondary　electrons.　Numerical　simulation　results　agree　well　with　experimental　results.　Experimental　and　simulation　results　show　that　those　micro-trap　structure　can　help　suppress　secondary　electron　emission　effectively,　and　the　depth-to-width　ratio　of　structure　will　enhance　the　effect　of　suppression　as　well.　Surface　structure　with　a　cylindrical　hole　resist　the　secondary　electron　emission　better　than　the　surface　structure　with　rectangle　groove　when　their　depth-to-width　ratios　are　the　same.　Furthermore,　a　sample　with　a　larger　depth-to-width　ratio　can　not　only　corresponds　a　less　maximum　secondary　electron　yield　and　a　larger　first　cross　energy,　but　also　improve　the　quality　factor　of　multipactor　discharge　F　linearly.　©　2018　Journal　of　Mechanical　Engineering.