A composite microbial system SYF with efficient cellulose-degrading capacity was constructed from rhizosphere soil of mangrove plant rich in bio-substances by limited generation selections.It was found that 83.6% of Bruguiera gymnorrhiza leaves,71.5% of Rhizophora stylosa leaves and 67.3% of filter paper were degraded by the composite microbial system at 30 ℃ within 10 days under static culture conditions with the CMCase activity of 102.2,126.3 and 110.7 U/mL respectively.The microorganism diversity of SYF was analysis by the plate screening m...