This study determined the effects of the combined use of nitrogen fertilizer and organic manure on the greenhouse gas emissions, cumulative emissions, emission intensity(GHGI), and global warming potential(GWP)of early rice fields. The greenhouse gas produced through different treatments, including conventional chemical fertilizer and the combination of chemical fertilizer and organic manure [pig manure(PF), biogas slurry(BF), pig manure composting(DF), and green manure(GF)], was collected by closed static chamber method in the long-term fertilization experiment area. Results indicated that different treatments resulted in varying levels of greenhouse gas emissions. Compared with conventional chemical fertilizers, all treatments with organic manure increased CH_4 and CO_2 emissions in the early rice field, while N_2O emissions decreased 7.09% and 4.89% in the PF and DF treatments, respectively. The addition of organic manure to the chemical fertilizer increased GWP between 5.00% and 59.58% and rice yield between 6.15%~12.10%. Choosing suitable organic fertilizer can also reduce the GHGI value of rice fields. This study reveal that, of the various treatments, DF is an especially effective method for increasing production and decreasing greenhouse gas emissions in early rice fields.