Abstract: Greenhouse gas emissions (CH₄ and N₂O) from municipal solid waste landfills were investigated using the gas chromatography (GC)-static chamber method. The diurnal variations of CH₄ and N₂O emissions in three different landfill areas were monitored. In addition, greenhouse gas emissions under different conditions of landfill lifts, landfill age (4-13 a), cover soil type (80-100 cm), and gas collection systems were investigated. The rhythms of CH₄ and N₂O fluxes from MSW landfills were studied diurnally, and under over four selected seasons. The results showed that CH₄ and N₂O emissions varied substantially with landfill age and depth. Compared with the oldest landfill age (10-15 a) and the deepest depth (80-100 cm), the minimum emissions observed varied by two orders of magnitude. The landfill showed significant spatial and temporal variations, due to great natural heterogeneities. Although the diurnal and seasonal variations of CH₄ and N₂O fluxes in the three selected landfill sites were different from each other, the least emission fluxes were observed in spring, with the CH₄ flux of 30 and N₂O flux of 186.49 μg/(m²·h). CH₄ and N₂O fluxes were higher in summer and during the transitions of the autumn/winter and winter/spring. About 70% of the greenhouse gases were emitted in the evening. The landfill is a highly heterogeneous system. CH₄ fluxes were not significantly correlated with soil temperature and soil water content during the measurement, while N₂O fluxes were positively correlated with soil temperature and soil water content. The diurnal and seasonal variations of CH₄ fluxes showed better stability, with variation coefficients in the range of 13% to 405% and 43% to 429% separately. There were great diurnal and seasonal variations of N₂O emissions, with variation coefficients in the range of 15% to 1005% and 17% to 1552% separately. This implies that low frequency measurements are likely resulting in greatly over-or under-estimated N₂O emissions. It is necessary to provide full-time monitoring and control of greenhouse gas emissions.