New way to effectively capture CO2 in coal fired power plant is the combustion of coal using oxy-fuel technology. Combustion characteristics of Minco sub-bituminous coal at oxy-fuel conditions using TGA and drop tube furnace (DTF) were included activation energy, volatile yield, combustion efficiency, the prepared char porosity and ash fusion temperature. TGA results shows that the effect of CO2 in combustion kinetics reduces activation energy by approximately 7 kJ/mol at air oxygen level(21% O2) and decreases the burning time by approximately 16%.