To　better　understand　the　effects　of　a　special　microbubble　biodegradation　process　on　the　anaerobic　leachate　digestion　in　a　sequencing　batch　biofilm　reactor　(SBBR)　using　the　micro-bubbles,　the　evolution　of　dissolved　organic　matter　(DOM)　was　investigated　using　UV-Vis　and　fluorescence　spectroscopy.　The　purpose　of　this　study　was　to　compare　the　microbubbles　performance　with　that　of　a　conventional　bubble　reactor.　The　results　suggested　that　the　microbubbles　biodegradation　process　decreased　the　molecular　weight,　the　degree　of　saturation　and　aromatic　polycondensation,　and　the　number　of　oxygen-containing　functional　groups.　Microbubbles　increased　the　protein-like　and　humic-like　materials　and　functional　groups　such　as　carbonyls,　carboxyls,　hydroxyls,　and　ester　groups.　The　results　indicated　that　microbubbles　can　improve　the　degree　of　biochemicalization　and　the　overall　environment　for　microbial　growth.