For　the　dynamic　load　characteristics　of　Wireless　sensor　network,　we　propose　the　idea　of　parallel　Coalition　and　introduce　the　game　theory　into　the　solving　of　dynamic　task　allocation　problem.　In　this　paper,　we　design　the　model　of　multiple　task　allocation　based　on　Nash　equilibrium,　and　use　runtime　of　task,　Transmission　energy　consumption　and　Residual　energy　to　design　the　utility　function　of　Games.　Then　we　use　PSO　to　find　to　the　point　of　Nash　equilibrium.　By　using　this　method,　guarantee　the　task　execution　effectiveness　and　improve　the　utilization　rate　of　networks.　Simulation　results　prove　the　validity　of　the　algorithm,　and　can　effectively　prolong　the　lifetime　of　the　network.　©　Springer-Verlag　Berlin　Heidelberg　2013.