This　paper　proposes　an　efficient　downlink　scheduling　algorithm　for　IEEE　802.16m　System.　It　is　focus　on　presenting　and　analyzing　base　station　allocation　of　subcarriers　and　adaptive　modulation.　Proposed　scheduling　algorithm　is　based　on　particle　swarm　optimization　algorithm.　We　improved　the　convergence　and　searching　ability　of　the　particle　swarm　algorithm　through　the　method　of　niche　technology　and　dynamic　inertia　weight.　The　numerical　results　showed　that　our　proposed　algorithm　is　better　than　static　schemes　FDMA　in　IEEE　802.16m　system.　©　2008　IEEE.