Abstract: High-temperature aerobic composting has been ever-increasing developed rapidly for the fastest way to make high quality compost without any foul odors. However, the greenhouse gas (GHG) can also be produced during composting, including CH4 and N2O. In this study, a 35-day aerobic co-composting of kitchen waste and yard trimming (chipped stems) was carried out in 60 L forced aerated static composting reactors, in order to reduce the GHG emission during composting. Three commercial microbial agents were also added to compost materials, including the VT1000 compound consortia (VT), Bacillus subtilize (BS), and Bacillus licheniformis (BL). Among them, the addition of fungi was 1.5% of the dry weight of all raw materials. The treatment without bacterial agents was used as the control (CK). Furthermore, CH4 and N2O emissions during composting were monitored to investigate the effect of the microbial agents on the GHG emission. The results showed that the microbial agents significantly accelerated the maturity of compost with the rise of temperature, whereas, relatively reduced the GHG emission in the varying degrees. The duration of high temperature in all treatments was fully met the harmless requirements, in terms of reactor heating. But the treatment with the microbial agents presented the better secondary heating. The fastest temperature recovery and the highest temperature were achieved in the VT, followed by the BS, and the BL was slower than the CK. In maturity, the electric conductivity and pH value in all treatments were met the industrial requirements of compost quality. Specifically, the uninoculated microbial agent failed to the rot standard in the CK treatment. A slightly better compost maturity was obtained in the BS treatment, compared with the VT and BL. Among the GHG emission reduction, the N2O emission was accounted by 76.83%-88.57% of the total as the CO2-C equivalent, indicating the much higher amount than that of CH4. The peaks of emission occurred at the initial and mature stage. The CH4 emission peak occurred at the cooling stage, where the cumulative emissions reached 1.65%-2.40% of the total GHG emissions equivalent. The cumulative CH4 emissions in the four treatments were ranked as CK, BL, BS, VT in the descending order. As such, the best performances (18.89%) of the CH4 and N2O emission reduction were achieved in the VT and BS treatment, respectively. The reduction rates were 49.22%, 61.86%, and 35.32% in the BS, VT, and BL treatment, respectively. The total GHG emissions equivalent were 95.84 (CK), 52.31 (VT), 42.03 (BS), and 62.49 kg/t (BL). Compared with the CK, the best total GHG mitigation was obtained in the BS treatment, with the reduction rate of 56.15%, the BL treatment was the lowest of 34.80%, while the VT treatment was 45.42%. The N2O abatement was better performed than methane with the inoculants, ranging from 35.32% to 61.87%. Taken together, the best effect was achieved in the treatment with 1.5% BS. Therefore, the microbial agents can be expected to effectively mitigate the GHG for the better quality of composting products.