INTRODUCTION Since 1970, global warming has been an issue followed by weather change due to rapid industrial developments in many area and IPCC(Intergovermental Panel on Climate Change) has been effecting agricultural aspects in many ways. Acquiring emission coefficients and evaluate emission levels that fit to korean agricultural environment is needed to be adapted to the environmental weather change due to greenhouse gas. We have been evaluating N2O emission as levels of nitrogen fertilizer during red pepper cultivation in flat upland since 2009. METHODS N2O emission was measured in chemical nitrogen fertilizer amount 0(N 0), 95(N 0.5), 190(N 1.0), 380(N 2.0) kg ha-1 by using the abnormal shape chamber closed repeating three times. All experiments were performed in red pepper cultivation in flat upland. Emission levels were measured by changing of N2O concentrations in chamber during 30 minutes from AM 10:00 to AM 10:30 twice a week. The data were analyzed with gas chromatography (GC/ECD detector), and the temperature differences within the camber, ground temperature, soil water content, soil chemical properties, and weather data were also acquired. RESULTS The total N2O emission of each treatment in red pepper field was 2.721(N 0), 3.670(N 0.5), 4.974(N 1.0), and 6.500(N 2.0) kg N2O ha-1 yr-1. And then the primary regression between nitrogen fertilizer amount and total N2O emission was showed as y=0.1005x + 2.7954 (r2=0.9879), and an average of the default value was EF1 0.018(0.0111~0.0132) N2O-N kg N-1 kg-1. These results were in similar tendency as in the default value of the IPCC 2006 guideline(EF1 0.003~0.03) when the results are converted into emission defaults. CONCLUSION Conclusively, we expect that this study can be applied to acquire emission default and evaluate N2O emission, which are appropriate for the different field crops in Korean agricultural environment.