In this context, the work dealt with the characterization of chars obtained by the pyrolysis of maize sialk and the effects of phlolysis terperature and heating fate on the char preparence. The pyrotyes was Performed at atmospheric pressure and temperatures ranging from 600 to 1000 degrees C under low heating rate (LHR) and high heating rate (HHR) conditions. The chars were characterized by ultimate analysis, X-ray diffraction (XRD), helium density measurement, N-2 isothermal adsorption/desorption method, and Fourier transform infrared spectroscopy (FTIR), The results indicated that the whir characteristics markedly depended upon pyrolysis conditions, particularly temperature. The char yield decreased from 22 to 16.3% with increasing temperature from 600 to 900 degrees C. The decrease ill H/C was more than twice that in O/C As the temperature increased, maize stalk chars had a slightly less amorphous structure and less aliphatic side chains and became more aromatic and ordered, At a HHR, progressive increasos ill porosity development with increasing pyrolysis temperature occurred, whereas a maximum development of micro-and meso pores appeared at 900 degrees C. The surface area of char reached a maximum of 81.6 m(2)/g at 900 degrees C and decreased slightly at higher temperatures. Over 900 degrees C, structural ordering, pore widening, and/or the coalescence of neighboring pores led to the decrease in the surface urea values, resulting in thermal deactivation of the chars. The influence of the heating rate on the surface area was no significant. FTIR analysis showed that the hydroxyl, aliphatic C-H, and carbonyl and olefinic C-C groups were. lost at high temperature. The loss of ether groups led to a more ordered carbone structure.