Based on the staged conversion technique of brown coal pyrolysispartial gasification and residual carbon combustion in circulating fluidized bedsrapid and slow coal char were produced from the brown coal of Shigouyi coal mine in Ningxiaat the temperatures from 700 to 950 in a horizontal tube furnace.The effects of pyrolysis conditions on the surface morphology and structure of the coal chars were investigated.A contrastive study was conducted using thermogravimetric technologytesting the reactivity of coal chars gasification with steam and CO2.The effects that gasification temperaturepyrolysis temperature and pyrolysis rate have on the gasification reactivity of coal chars were also analyzed.The results show that gasification temperature is the most important factor influencing gasification ratewhile pyrolysis temperature has a weaker effect.Howeverthere is great difference in gasification reactivity between steam and CO2which decreases as gasification temperature rises.Compared to steam gasificationpyrolysis conditions have greater influence on CO2 gasification.The relation of reaction indexes between steam and CO2 gasification can be expressed using a quadratic regression equationand a linear relationship exists between the distributed activation energy of both reactions in a carbon conversion range from 10% to 80%.