In recent years, an acceleration of global warming and various environmental pollution problems has been observed due to the increase in energy demand. Biomass, which has several advantages over more typical sources, is very popular as a green energy source. This study focuses on process modeling and analysis of biomass fast pyrolysis. The fast pyrolysis reaction mechanisms, proposed by previous researchers, are applied to the modeling of a fast pyrolysis reactor. This process analysis is performed according to operating conditions such as the reaction temperature, residence time, type of biomass and reactor type. To evaluate these results, the results of the process analysis of other researchers and the GC/MS (gas chromatograph-mass spectrometry) data of fast pyrolysis experiment are compared.