The aim of this paper was to investigate the effect of heating rate on char, bio-oil and gas yield obtained via slow pyrolysis of energy crops. Experiments were performed in thermobalance coupled with mass spectrometer. The initial temperature was 303 K and it was gradually increased at heating rate 5, 10 and 20 K×min^-1 to 873 K. Dried and grounded energy crops – Miscanthus giganteus, Sida hermaphrodita and Sorghum Moench – were used as the substrate. The greatest degree of thermal decomposition under the condition of 873 K and 5 K×min^-1 was obtained for Sida hermaphrodita (76.6 wt.%) and the smallest degree for Sorghum Moench (70.5 wt.%). With the increase in heating rate, the yield of char decreased, the yield of bio-oil increased and the yield of gas was almost on the same level.

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