In　this　paper,　we　develop　a　real-time　adaptive　task　allocation　algorithm　based　on　parallel　dynamic　coalition　in　WSNs.　The　algorithm　gives　a　priority　level　to　each　task　according　to　the　idea　of　EDF.　And　the　task　with　relatively　higher　priority　will　be　scheduled　firstly.　When　coalitions　are　parallel　generated　through　PSO　algorithm,　the　corresponding　task　of　coalition　will　be　allocated　according　to　the　current　load　of　sensors　and　the　remaining　energy　balance　degree.　The　experimental　results　show　that　the　proposed　algorithm　has　strong　capability　to　meet　deadline　constraint　and　it　can　prolong　the　lifetime　of　the　whole　network　significantly.