The　combustion　process　of　two　kinds　of　single　coal　chars　particle　was　studied　by　using　the　TGA　method.　The　effect　of　mass　transfer　of　gas,　ash　layer　diffusion　and　inherent　oxidation　reaction　resistances　on　the　combustion　process　was　investigated.　An　analysis　method　for　single　coal　char　particle　combustion　process　and　a　new　method　determining　inherent　combustion　reaction　constant　were　established.　It　was　found　that　the　total　resistance　of　combustion　decreased　with　the　combustion　process.　While　the　reaction　approached　the　end,　the　total　resistance　of　combustion　reached　a　fixed　value.　At　this　point,　combustion　resistance　was　equal　to　inherent　combustion　reaction　resistance,　and　thus　the　inherent　kinetics　constant　was　obtained.　By　experimental　investigation　under　different　air　flow　rates,　temperatures　or　particle　diameters,　the　consistency　of　this　method　was　verified.　The　inherent　combustion　reaction　constant　and　activation　energy　were　measured　with　this　method,　and　agreed　well　with　the　traditional　method.　©　All　Rights　Reserved.