The　gear　processing　technology　can　be　analyzed　by　testing　the　gear　noise.　For　this　purpose,　a　set　of　gear　noise　test　system　was　developed.　A　DSP　hardware　system　was　designed　to　test　and　analyze　the　gear　noise.　The　signals　were　transferred　to　the　PC　through　the　USB　module　for　further　comparative　analysis.　The　gear　noise　signal　spectrum　analysis　was　carried　out　in　the　PC　signal　processing　software.　The　experimental　results　show　that　the　system　can　accurately　acquire　and　process　the　gear　noise　signals,　and　it　can　be　used　to　analyze　the　gear　processing.