In order to explore the effects of different amounts of biochar applied in purple paddy soil on greenhouse gas (GHG) emissions,potted experiments using a static opaque chamber and gas chromatography method were used to study the regulations and influences of biochar on soil greenhouse gas emission using five treatments: no fertilizer (CK) ,conventional fertilization (NPK) ,10 t·hm~(-2) biochar+ NPK (LBC) ,20 t·hm~(-2) biochar+ NPK (MBC) ,and 40 t·hm~(-2) biochar+ NPK (HBC) . ① Soil CH_4 emission flux reduced significantly with all biochar application treatments; the emission flux followed the order,from large to small,of NPK > CK > LBC > MBC > HBC. The CH_4 emission flux of each treatment showed a single peak curve,and the peak value was mainly concentrated in the late growth stage of the paddy cropland. During the entire observation period,the emission flux of CH_4 was between - 0.05 mg·(m~2·h)~(-1) and 47.34 mg·(m~2·h)~(-1) . The CO_2 emission flux of each treatment was complicated and ranged from 32.95 mg·(m~2·h)~(-1) to 1 350.88 mg·(m~2·h)~(-1) . The CO_2 emission flux of the LBC and MBC treatments showed bimodal curves,and the CO_2 emission flux of other treatments showed single peak curves. In addition,all biochar treatments delayed the peak time of the CO_2 emission flux. The N_2O emission flux of each treatment ranged from - 309.39 to 895.48 mug·(m~2·h)~(-1) ,and the N_2O emission flux of the LBC treatment showed a bimodal curve,while other treatments showed single peak curves. ② Compared with the CK treatment, biochar treatment can significantly reduce the cumulative emissions of CH_4 and promote the cumulative emissions of CO_2 and N_2O. The average amount of CH_4 cumulative emissions followed the order CK > LBC > MBC > HBC,while the average amount of CO_2 cumulative emissions followed LBC > MBC > HBC > CK,and the average amount of N_2O cumulative emissions followed HBC > MBCLBC > CK. Compared with conventional fertilization treatment,different application rates of biochar addition significantly reduced CH_4 and CO_2 emissions. As more biochar was added,CH_4 and CO_2 cumulative emissions were lower. Although the regulation of N_2O cumulative emissions on biochar addition was not obvious,the application of nitrogen fertilizer could promote the emission flux of N_2O to some extent. ③ Over the time scale of 100 years,the integrated global warming potentials (GWP) of CH_4 and N_2O emission under different biochar treatment were decreased significantly,indicating that biochar combined with chemical fertilizer is an effective GHG emission reduction measure.