Abstract: Coal char gasification with CO2 was studied in the 900-1500℃ temperature range of ash fusion under normal pressure. It was found that the activation energy changed with the gasification process. Except for the initial stage of reaction, gasification was affected seriously by internal diffusion. There was a characteristic temperature in coal char gasification at a high temperature, where the gasification rate was significantly reduced in the intermediate and final stages of reaction. Its effect covered about 200-300℃ around the characteristic temperature, its value was related to many factors, such as the kind of coal, the properties of ash etc., generally lower than the ash softening temperature.