Abstract: CH₄ emissions from two full-scale sanitary landfills for municipal solid waste (MSW) were investigated by static chamber method based on the diurnal and seasonal variations in spring and summer. The influencing factors on landfillCH₄ emissions were evaluated as well. The results indicated that CH₄ emissions could be minimized substantially by landfill gas (LFG) recovery system. Comparing similar landfills with ages of 4.0-4.5 years, the average CH₄ flux 〔(541±1，005) mg/(m²·h)〕 from the landfill site without landfill gas recovery was 4.4 times larger than the landfill site with landfill gas recovery. In landfill sites with landfill gas collection, comparing similar landfills with ages of 1.0-1.5 years, the average CH₄ flux 〔(324±847) mg/(m²·h)〕 from the test lifts without leachate irrigation was 10.0 times larger than those from the test lifts with leachate irrigation during the spring and summer measurements. In the landfill sites with LFG collection, CH₄ fluxes were not significantly correlated with environmental factors during the measurement, while CH₄ fluxes were positively correlatedwith the soil and air temperature, and negatively correlated with the atmospheric pressure in the landfill site without LFG collection. There were positive correlations between CH₄ fluxes and soil moisture, organic carbon and total nitrogen contents in cover soils as well.