Residual lignin was extracted from corncob hydrolysis residues using modified enzymatic mild acidolysis lignin (EMAL) method. The pyrolytic characteristics of the extracted lignin was investigated by thermal analyzer (TA), and its kinetic model was studied as well. It was shown that the pyrolysis of residual lignin mainly occurred at the temperature range of 200~500℃, with two loss peaks at 270℃ and 400℃ respectively. Kinetic study indicated that pyrolysis of residual lignin belongs to twoorder reaction. The main functional groups in residual lignin was characterized by fouriertransform infrared (FTIR) spectroscopy, which showed that main functional groups were not destructed during isolation. The surface morphology of residual lignin and its pyrolysis char was studied by scanning electronic microscopy (SEM). The analyses showed that the individual particles of lignin were polygonal in shape with multiple conchoidal fracture surfaces, which undergone brittle and plastic deformation during pyrolysis. When pyrolysis temperature increased, the char was more uniformed.