This　paper　analyzes　the　current　MAC　layer　protocol　for　wireless　sensor　networks　based　scheduling,　according　to　the　transmission　of　mine　environment　signal　needs,　around　the　traditional　CSMA/CA　technology,　a　scheduling　algorithm　is　proposed　adjustment　factor　based　on　the　contention　window　to　more　effectively　avoid　data　collisions　at　the　MAC　layer　transmission　process.　In　order　to　ensure　more　equitable　sharing　of　all　nodes　in　wireless　link　bandwidth.　Simulation　results　show　that　the　algorithm　can　effectively　improve　the　information　in　the　MAC　layer　transmission　reliability.　©　(2014)　Trans　Tech　Publications,　Switzerland.