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In this study,a full-scale intemal circulation (IC) reactor coupled with an extemal circulation system was developed to treat high-strength leachate from a municipal solid waste (MSW) incineration plant,in which anaerobic sludge granulation was intensively investigated.Results showed that the IC reactor achieved excellent treatment performance under high organic loading rates (OLR) of 21.06-25.16 kg chemical oxygen demand (COD)/(m3.day).The COD removal efficiency and biogas yield respectively reached 89.4％-93.4％ and 0.42-0.50 m3/kg COD.The formation of extracellular polymeric substances (EPS) was closely associated with sludge granulation.Protein was the dominant component in sludge EPS,and its content was remarkably increased from 21.6 to 99.7 mg/g Volatile Suspended Solid (VSS) during the reactor operation.The sludge Zeta potential and hydrophobicity positively correlated with the protein/ polysaccharide ratio in EPS,and they were respectively increased from-26.2 mV and 30.35％ to -10.6 mV and 78.67％,which was beneficial to microbial aggregation.Three-dimensional fluorescence spectroscopy (3D-EEM) and Fourier transform infrared spectroscopy (FT-IR) analysis further indicated the importance of protein-like EPS substances in the sludge granulation.Moreover,it was also found that the secondary structures of EPS proteins varied during the reactor operation.