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Structural morphology and surface features of torrefied cornstalk are investigated under the given torrefaction temperatures of 250 °C, 270 °C, or 290 °C and the different atmospheres at Air or N2. The surface functional groups and pore volume distribution tests are conducted experimentally with Fourier Transform Infrared Spectrometer and N2 adsorption/desorption methods, respectively. Meanwhile the morphology analysis proceeds by comparing scanning electron microscope images directly. The results show that the adsorption capacity is well developed more than 2 times as the torrefaction process is O2 involving. The adsorption capacity of meso-pores can be enhanced significantly with the rising torrefaction temperature. The experimental data indicate that the presence of O2 leads to the complicated microscopic surface morphology and varies the adsorption/desorption characteristics of the torrefied cornstalk, obviously. [ABSTRACT FROM AUTHOR]