This study monthly combustion tests were conducted on pine green leaves during June 2008 similar to May 2012 (4 years) for combustion pattern analysis of forest fires according to climate change in Korea. As result of research, fuel humidity of 75 similar to 178% was shown for 4 years in which much difference was shown according to climate. Period of frequent forest fires with high risk was shown to be in April and November, and it was shown that influence of fuel humidity was shown. Especially, April showed pattern of relatively higher risk of forest fires than October and range of auto ignition temperature was 270 similar to 355 degrees C in which temperature difference of 85 degrees C was shown according to climate change. Total heat release was shown in range of 11 similar to 72 MJ/m(2) for 4 years, as April showed 41 similar to 56 MJ/m(2) and November showed 21 similar to 33 MJ/m(2) that April which had low fuel humidity showed relatively high heat release. Total smoke release was shown in range of 159 similar to 951m(2)/m(2) for 4 years, as April showed 311 similar to 951 m(2)/m(2) and November showed 246 similar to 322 m(2)/m(2). Therefore, it could be known that April relatively releases more smoke than October. For carbon release, CO showed 1.6586 similar to 26.1460 g range and CO2 showed 36.412 similar to 100.01 g range for 4 years and this concentration of combustion product has severe change by season that high release of CO CO2 is shown in April through May.