Methane (CH₄) and nitrous oxide (N₂O) are important green house gases. The large amount of CH₄ is released from ruminant and the excreta. Excreta from grazing animal also stimulate N₂O emission in pasture. To observe the effect of global warming on CH₄ and N₂O budget in grazed pasture, soil warming experiment was conducted using an electric infrared heater. We set up control and warming plots, which was increased soil temperature at 3 cm depth by about 2 °C using the heater. We measured CH₄ and N₂O flux in a pasture (Zoysia japonica) and cattle dung patch from June to September 2009. In pasture, control and warming　plots absorbed CH₄ slightly under normal condition although warming plots emitted CH₄ after fertilization. N₂O fluxes were small in both control and warming plots. We found no effect of the warming experiment on N₂O fluxes. Dung patches emitted a large amount of CH₄ just after dung setting, and then decreased quickly. While control plots absorbed CH₄ after 25 days of the setting, warming plots emitted CH₄ continuously throughout the study period. Dung patches emitted the large amount of N₂O in both warming and control plots. And there is no difference of N₂O flux between the two plots in dung patches. Our results suggested that the effect of soil warming experiment can increase the CH₄ emission from dung patch although the experiment did not affect N₂O fluxes in both pasture and dung patch.