The application of biochar to enhance soil carbon sequestration in farmlands is an increasingly investigated research to reverse the effects of climate change. There is little report on the effect of adding manure in situ in combination with biochar application to winter paddy fields on CO_2 and CH_4 emissions during winter fallow and growth period of double rice. To fully use winter fallow paddy fields and determine how biochar and chicken manure affected the emission of CO_2 and CH_4,four treatments were set up - no fertilization(CK),chicken raised in the field and chicken manure addition(C),in situ chicken manure addition and biochar addition(CB),and biochar addition(B). The CO_2 and CH_4 fluxes and total emissions were determined in paddy fields using the chamber method along with Greenhouse Gas Analyzer during winter and the growth period of double cropping rice. The objective was to assess the effects of chicken manure in situ incorporation and biochar on soil carbon emission. The results showed that relationship between CO_2 flux under CK and B treatments and soil temperature at 5 cm soil depth fitted well the non-linear index model. Then CO_2 flux under C and CB treatments had no significant correlation with soil temperature at 5 cm soil depth,which meant that the in situ addition of chicken manure made it more sophisticated for soil to modulate CO_2 emission. The treatment of in situ addition of chicken manure significantly increased soil CO_2 emission in winter paddy fields and during rice growth period with respective emissions of 9 935.39 kg·hm~(-2) and 27 756.34 kg·hm~(-2),which was 58.7 times(P <0.01)and 56%(P <0.05)higher than that of CK. The cumulative CO_2 emissions in winter paddy fields and during rice growth period under biochar addition were 12.3 times(P <0.01)and 41%(P <0.05)higher than that of CK during in winter paddy fields and during rice growth period. The emissions of CH_4 in winter paddy fields and during rice growth period under treatment of in situ addition of chicken manure were significantly higher than that under other treatments,while it was not significantly changed in winter paddy fields and significantly decreased during rice growth period under biochar addition treatments. Chicken manure in situ application in combination with biochar treatment also significantly improved CO_2 emission of paddy soils. Cumulative CO_2 emission under chicken manure in situ application along with biochar addition in winter paddy fields was significantly higher than that under chicken manure in situ application. Also during rice growth period,it was significantly lower than that under chicken manure return. This suggested that biochar addition inhibited soil CO_2 emission in the late period. The addition of biochar decreased soil CH_4 emission in both winter paddy field and rice growth stage. In short,the addition of exogenous organic carbon like chicken manure to soils increased carbon emission(both CO_2 and CH_4),while the addition of biochar to soils increased carbon emission in the short-term and decreased CH_4 emission. Therefore,from the longer time view,biochar application to soils was beneficial to soil carbon sequestration,and might mitigate carbon emission caused by in situ application of chicken manure.