The co-pyrolysis characteristic of biomass and lignite were investigated in a Micro Fluidized Bed Reaction Analyzer under isothermal condition. The synergetic effect was evaluated by comparing the experimental gas yields and distributions with the calculated values, and iso-conversional method was used to calculate the kinetic parameters of formation of each gas component. The results showed that synergetic effect was manifested in co-pyrolysis. For the range of conversion investigated, the activation energies for H-2, CH4, CO and CO2 were 72.90 kJ/mol, 43.90 kJ/mol, 18.51 kJ/mol and 13.44 kJ/mol, respectively; the reactions for CH4 and CO2 conformed to 2 order chemical reaction model, and for H-2 and CO conformed to 1.5 order chemical reaction model; the pre-exponential factors for CH4, CO2, H-2 and CO were 249.0 S-1, 5.290 S-1, 237.4 S-1 and 2.693 S-1, respectively. The discrepancy of the kinetic parameters implied that there were different pathways for forming the different gas. (C) 2015 Elsevier Ltd. All rights reserved.