In order to inquire into the impacts of different biochar application on CO_2 andN_2O emission from maize field in the brown soil in northeast of China, the field experiment was conducted in Liaohe plain from 2016.4 farming measures, including CK(no biochar), C1(3000kg·ha~(-1) biochar), C2(5000kg·ha~(-1) biochar) and C3 (7000kg·ha~(-1) biochar), were taken in the experiment based on local normal nitrogen fertilizer application. CO_2 and N_2O emission from soil during whole maize growth season, started at sowing date, was measured periodical. The result showed that biochar application inhibited the intensity of soil respiration to some extent, so as to inhibit the emission of CO_2 in the soil, but they were no significant. CO_2 emission from the treatments of C1 and C2 was less than that of CK, decreased the accumulative emission by 9.9% and 8.0%, respectively. CO_2 accumulative emission from jointing-flowering stage was the highest, get reaching 800-1200mg·m~(-2)·h~(-1), and that of from seeding stage and full ripe stage was the lowest. However, there was a significant positive correlation between CO_2 average emission flux and soil temperature below 5cm. Biochar application also inhibited soil N_2O emission, and with increase of biochar, the soil N_2O emission decreased gradually. During the whole growth season of maize, N_2O emission flux was mainly affected by nitrogen fertilizer application. The emission flux of N_2O increased significantly and had obvious emission peak after basic nitrogen fertilizer and supplement nitrogen fertilizer. Compared with CK, N_2O accumulative emission from C1, C2 and C3 were reduced by 24.7%, 35.2%, and 37.0% in maize growth season. The results indicated that biochar application reduced CO_2 and N_2O emissions from soil. Biochar application had significance for carbon sequestration in maize field in brown soil region, improved soil properties and maintained the stable maize yield. Appropriate amount of biochar application for maize was a key to mitigate soil CO_2 and N_2O emissions.