To　solve　the　problem　of　task　scheduling　in　grid　service　composition,　based　on　the　system　model　of　grid　service　composition,　the　cooperative　game　among　service　containers　in　the　system　model　is　analyzed.　The　existing　theorem　of　unique　Nash　bargaining　solution　is　proved　and　the　solving　algorithm　is　designed.　Experimental　results　show　that　the　model　and　algorithm　have　better　experimental　effects　than　the　scheduling　algorithm　based　on　the　node　ability.