Peanut shells (PS) and sugar canes (SC) constitute an attractive and an energetic biomass source in Morocco since they are renewable, abundant and available. this work seeks to study the thermal decomposition of these biomass samples and their derived solid biofuel under oxidative atmosphere, and it also attempts to determine their kinetic and thermodynamic combustion parameters . The solid biofuel samples were produced by slow pyrolysis at a temperature of 400°C. Based on the TGA results, the biomass combustion process goes through three stages which are the evaporation of moisture, devolatilization and char formation. For the biochar, it takes two steps that corresponds to the evacuation of water and to the coal combustion. Kinetic parameters of each step are evaluated using Coats-Redfern method, and the thermodynamic parameters are calculated. The results have shown that biochar is less reactive than its original biomass, and that the biomass samples are the most reactive ones in the coal oxidation stage. We have also found that the biomass samples present a different combustion process. These results are useful for the configuration and the design of feasible systems for the conversion of this biomass into energy.