In this study, the Chongming Dongtan Natural Wetland in the Yangtze River estuary was selected as the control, and aerobic CH₄oxidation rate and related carbon sequestration characteristics were investigated in paddy field soils under different reclaimed years (19, 27, 51 and 86 a). The results show that soil organic carbon (SOC) content in reclaimed paddy fields is increased significantly with the increase of reclaimed year, whereas pH, EC, and SO₄^2- concentration of soils are gradually decreased. There is significant difference in aerobic CH₄ oxidation rates of soils under different reclaimed years, and the highest value is found in the 27 a reclaimed paddy field (32 μg/(g·d)). However, all of aerobic CH₄ oxidation rates are much lower in the reclaimed rice fields than that in the reed wetland (82 μg/(g·d)). The net increment of carbon sequestration (¹³C-SOC) driven by aerobic CH₄oxidation is 10.3-19.6μmol/g, significantly positively correlated with CH₄ oxidation rate. Carbon sequestration efficiency (net increment of ¹³C-SOC/¹³CH₄ conversion) of aerobic CH₄ oxidation is 61% in the reclaimed 86 a paddy fields, significantly higher than that in the 19 a and 27 a reclaimed paddy fields. The addition of N fertilizers (NH₄⁺-N, NO₃^--N, Urea) can significantly increase aerobic CH₄ oxidation rates in the reclaimed paddy soils, especially for NH₄⁺-N. On the contrary, N additions have no significant effect on the net increment of ¹³C-SOC in the reclaimed paddy soils, resulting in the reduction of carbon sequestration efficiency of aerobic CH₄oxidation. In conclusion, reclaimed year does not significantly influence aerobic CH₄ oxidation rate in coastal wetlands but increases carbon sequestration efficiency of aerobic CH₄ oxidation, N fertilizer can significantly improve aerobic CH₄ oxidation rate in reclaimed paddy fields.