In order to investigate the effect of biochar on CH_4 and N_2O emissions from Lou soil,field plot experiments of winter wheat were conducted with five levels of biochar addition (0,20,40,60,and 80 t·hm~(-2)). The fluxes of CH_4 and N_2O,wheat production, soil organic carbon,soil water content,and temperature of each soil layer were measured. The results showed that the fluxes of CH_4 and N_2O changed significantly in different growth periods of winter wheat. Compared with the control,the cumulative CH_4 uptake under the biochar amendment increased by 12.88%-71.61%. When the biochar addition was ≥40 t·hm~(-2),the cumulative CH_4 uptake was significantly higher and the highest uptake was at the level of 40 t·hm~(-2). Biochar amendment had no significant effect on cumulative N_2O emissions and the global warming potential (GDP). The greenhouse gas intensity (GHGI)decreased by 13.24%-22.14%. The wheat yield increased by 1.72%-32.19% after biochar addition. When the applied biochar level was ≥40 t·hm~(-2),the wheat yield increments were significantly higher. The biochar addition of 40 t·hm~(-2) was the optimal level for increasing the wheat yield. The soil organic carbon and water content under biochar amendment increased by 1.42-2.69 times and 7.08%-11.96%,respectively. The results suggested that Lou soil was the sink of atmospheric CH_4 and the emission source of N_2O during the winter wheat growth period, and the biochar level of 40 t·hm~(-2) was the optimal addition amount.