Two different sewage sludge composting products (with and without biochar) were applied in field to study short-term impacts of their application on the greenhouse gases (CH₄, CO₂ and N₂O) emission from soil. The results indicated that N₂O emissions mainly occurred in the first three weeks, with the emission amount accounting for 87.9%~95.6% of the total emissions during the observation period. The emission amount of N₂O increased with the application amount of compost (P<0.05), and N₂O emission from bare land was higher than that of crop plants treatment. The application of sludge composting can lead to the reduction of the N₂O emissions from soil, and the N₂O reduction amount increased with the increase of the fertilizing amount (P<0.05). CH₄ emission fluxes showed negative values in the early and late stages of the experiment, indicating that soil could adsorb CH₄. The absorption of CH₄ took place mainly after 18 days, accounting for 52.1%~66.7% of the total absorping amounts. The absorping amount of CH₄ in soil with biochar compost was 35.2% to 62.2% less than that in soil without biochar, and higher absorping amount of CH₄ appeared in bare land when compared with the land with planting crops (P<0.05). CO₂ emissions mainly occurred after 18days, accounting for 50.5%~61.8% of the total emission. The planting crops can promote the CO₂ emission in soil, which was 1.34~1.57 times that of the bare land. Thus, it can be speculated that land application of compost was a weak sink of CH₄ and a source of N₂O and CO₂ emissions during the observation period. The application of sludge composting can lead to the increase of the emissions of N₂O and CO₂ in soil. Sludge compost with biochar in short-term could reduce the N₂O and CO₂ emissions from soil, and the biochar played an important role in reducing the greenhouse gas emissions, as the emission amounts from soil with biochar compost was 20.41% to 62.51% less than that in soil without biochar.