In　order　to　characterize　the　dense　and　regular　level　of　aerobic　granular　sludge　(AGS)　which　was　cultivated　by　different　carbon　sources,　the　SEM　images　of　mature　AGS　were　used　in　the　study.　The　calculation　process　using　Photoshop　and　Fips2　on　fractal　characteristics　of　these　granules　was　built.　The　lowest　box-counting　dimension　was　bulking　aerobic　granular　sludge　cultivated　by　glucose　(No.1),　which　was　1.794±0.011;　the　box-counting　dimension　of　AGS　cultivated　by　peptone　(No.3)　and　domestic　sewage　(No.5)　were　reached　up　to　1.866　±0.018　and　1.880±0.015.The　boundary　box-counting　dimension　of　the　AGS　was　also　calculated　and　the　average　value　was　1.14.　The　AGS　cultivated　by　beer　(No.6)　was　more　regular　in　shape　and　the　boundary　box-counting　dimension　was　1.115±0.003.　The　AGS　cultivated　by　landfill　leachate　(No.7)　was　the　most　irregular　in　shape.　This　study　indicates　that　fractal　dimension　provides　an　approach　for　quantification　of　dense　and　regular　level　of　AGS,　furthermore,　it　could　be　used　to　characterize　the　status　of　AGS,　such　as　bulking.