Excessive nitrogen fertilization can increase the greenhouse gas emission.It is important for agricultural production to find the reasonable nitrogen reduction measures by determining the greenhouse gas emission.Three different nitrapyrin-N fertilizer rates(N1-3)and no N control(N0)were set up to collect gas using static chamber method to study on soil CO_2,CH_4 and N_2O emission characteristics during maize and wheat growth stages.At the same time,the comprehensive warm potential of different dosages of pyridine spraying urea potential was quantitatively evaluated.There were obvious seasonal characteristics of greenhouse gase emissions under different nitrapyrin-N fertilizer rates.There was an obvious seasonal variation of the emission fluxes of CO_2 in maize and wheat season.The average emission flux of CO_2 in wheat season was significantly lower than that in maize,while the cumulative emissions was on the contrary.There was a soil N_2O emission peak after basal or topdressing fertilizer of different nitrapyrin-N application rates in maize and wheat season.For the whole rotation system, with the increase of nitrapyrin-N rates,soil CH_4 emission was decreased,while soil N_2O and CO_2 emission were increased.The global warming potential(GWP)of total greenhouse gas from rotation system was mainly determined by CO_2,and little by CH_4.The total GWP of different nitrapyrin-N rates in maize and wheat season was higher than that in the control,so fertilization increased the soil greenhouse gas warming capabilities.The positive net GWP in maize season indicated that the maize field was a source of greenhouse gas,and the net negative GWP in wheat season showed the wheat field was a sink of greenhouse gas.It also showed that GWP in the maize and wheat rotation system increased with the nitrogen application rate increase. Therefore,we should scientifically control N fertilizer rates to reduce the soil greenhouse gas warming capabilities.