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This paper studied the effects of chicken manure, swine waste and cattle manure on the CO2 and CH4 fluxes of a farmland planted with summer maize. The results showed that the CO2 flux had the same trend under different organic manure application, which was influenced by soil temperature and soil water content. The flux was significantly related with air temperature, soil surface temperature and soil temperature (P < 0.05). When soil temperature was not a limiting factor, soil water content was significantly related with soil CO2 flux. At most maize growth stages, soil was a sink of CH4. The variation of CH4 source-sink was influenced by environmental factors, but the correlation was not significant. The mean seasonal flux of CO2 was from 0.5124 to 0.8518 g x m(-2) x h(-1), and that of CH4 was from - 0.0068 to - 0.0484 mg x m(-2) x h(-1). Compared with CK2, maize planting and organic manure application enhanced CO2 emission. The application of organic manures inhibited the CH4 uptake by soil, and higher application rate had a higher inhibitory effect.