The reactions of biomass char CO2-gasification within granulated blast furnace slag (BFS) were systematically conducted by the non-isothermal program using a thermogravimetric analyzer. At the same time during reaction proceeded, the conversion of biomass char CO2-gasification reaction increased with the increasing heating rate. However, at the same temperature during reaction proceeded, the conversion of biomass char CO2-gasification reaction decreased with the increasing heating rate. The granulated BPS could be used as a catalyst in the biomass char CO2-gasification reaction and its catalytic effect became more obvious with the increasing content of BFS in the mixture. The A(4) model (nuclei production (m = 4) model) selected through the novel two-step method firstly proposed in the study was the best match with all the gasification reactions. The activation energy was from 52.75 kJ/mol to 64.42 kJ/mol and was lower with the increase of heating rate and the content of BPS in the mixture. The kinetic equations of biomass char CO2-gasification reaction within granulated BPS were developed through the selected model and calculated kinetic parameters. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.