Abstract: The coal chars derived from the Chinese typical coals treated under different pyrolysis conditions were evaluated from the perspective of structure and reactivity in chemical looping combustion（CLC） process. The effects of coal rank, pyrolysis temperature and pyrolysis rate on the reactivity performance, pore structure and microcrystalline structure of coal chars were investigated. The results indicated that the lower the coal rank, the pore structure of coal char was better and its reactivity was higher. These three types of coals showed different pyrolysis behaviors with respect to the effect of pyrolysis temperature, lignite char showed worse pore structure and higher degree of microcrystalline structure ordering under higher temperature, resulting in lower reactivity of lignite char, whereas the bituminous coal char and anthracite coal char showed their best reactivity performance at 900℃, in which pore structure property was the major factor influencing the reactivity of these two coal chars. Fast pyrolysis condition could significantly improve the pore structure of coal char and lower the degree of microcrystalline structure ordering, making the reactivity of three fast pyrolyzed coal chars obviously higher than that of three slow pyrolyzed coal chars.