Combustion characteristics of wood crib fire under two different conditions, i.e. accelerant added and not added, was studied to investigate the accelerant effect on combustion characteristics of combustible materials. The experiments were carried out in a full-scale room in accordance with ISO9705, where multi-parameters were measured, such as heat release rate, mass loss rate, temperature field and species concentration. At the same time, this process was numerically simulated. The computational results were consistent with experiment data.