The effects of sheep urine and dung patches on methane (CH_4) and carbon dioxide (CO_2) fluxes were investigated during the summer-autumn in 2010, to evaluate their contribution to climate change in a desert grassland in Inner Mongolia, China. Results indicate that the cumulative CH_4 emissions for dung patches, urine patches and control plots were -0.076, -0.084, and -0.114 g/m^2 and these were net CH_4 sinks during the measured period. The level of CH_4 intake from urine and dung plots decreased 25.7%, and 33.3%, respectively, compared with a control plot. CO_2 fluxes differed (p<0.01) in urine plots, with an average of 569.20 mg/m^2/h compared with control plots (357.62 mg/m^2/h) across all sampling days. Dung patches have cumulative CO_2 emissions that were 15.9% higher compared with the control during the 55-d period. Overall, sheep excrement weakened CH_4 intake and increased CO_2 emissions.