In　this　paper,　we　address　the　problem　of　topology　control　in　wireless　sensor　networks　(WSNs).　Taking　energy　consumption　and　reliability　into　account,　we　consider　topology　control　to　be　a　problem　of　multi-objective　degree-constrained　minimum　spanning　tree　(mcd-MST)　and　present　an　improved　discrete　particle　swarm　optimization　(PSO)　algorithm　for　generating　such　topology　schemes.　The　simulation　results　compared　with　genetic　algorithm　(GA)　show　that　this　algorithm　could　obtain　higher　robust　structure　and　lower　contention　topology　schemes.　©2009　IEEE.