The　recent　work　and　existing　problem　of　service　composition　are　analyzed　in　this　paper.　Based　on　the　quality　of　service　model,　the　quality　of　service　estimation　problem　for　service　composition　is　studied　mainly.　A　kind　of　mathematical　model　for　quality　of　service　estimation　of　service　composition　is　presented.　And　the　comprehensive　evaluation　of　heterogeneous　data　quality　of　service　(QoS)　is　researched.　This　paper　presents　a　novel　Fuzzy　making-based　Web　service　Composition　algorithm　to　solve　the　problems　above.　This　algorithm　can　evaluate　QoS　based　on　information,　and　thus　for　the　comprehensive　decision-making.　Its　characteristics　and　related　works　are　analyzed,　and　its　validity　is　validated　through　simulation　experiment.