The bio-oils selected for the characterization were those ob- tained at the pyrolysis conditions which gave the maximum bio-oil yield. For this purpose, spectroscopic and chromato- graphic methods were used. The elemental composition and calorific value of the oils were determined. The calorific values of the corncob and oil were determined using Gal- lenkamp Auto Adiabatic Bomb Calorimeter according to ASTM D 240. Elemental analyses of the raw material and product were performed on an LECO CHNS 932 Elemental Analyzer.