[Objective] The effects of extreme precipitation events on ecosystem carbon flux in different growth periods were studied, in order to provide a theoretical basis for accurately assessing the response mechanism of an artificial coniferous forest ecosystem to extreme weather at Qianyanzhou of Ji'an City, Jiangxi Province.[Methods] The response of carbon flux to changes in environmental factors (net radiation RN, temperature TA, soil water content SWC, and enhanced vegetation index EVI) in the early growth period (April) and flourishing period (June) in 2008 and 2010 were compared.[Results] The net ecosystem productivity (NEP) decreased by 22.87% in April, mainly due to a decrease of 17.36%[GEP, 9.56 g/(m²·d)] in total primary production and 2.84%[RE, 2.86 g/(m²·d)] in ecosystem respiration by 17.36%[GEP, 9.56 g/(m²·d)]. While in June, a decrease of 3.58%[7.17 g/(m²·d)] in GEP and an increase of 12.8%[20.37 g/(m²·d)] in RE, led to a decrease of 65.77%[27.55 g/(m²·d)] in NEP.[Conclusion] The inhibition of RE caused by the reduction of TA at the early growing season was greater than that caused by the increase of soil moisture content, while the increase in soil moisture during the flourishing period would offset the inhibition of cooling on respiration, resulting in greater carbon loss. Therefore, the impacts of carbon flux on extreme climate should also be considered in future studies.