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The preliminary measurements of nitrous oxide fluxes from the ithogenic soils on tropical Xi-sha atoll were made using a wetland sites in salt marsh of Dong Island were approximately one order of magnitude lower than those from the ithogenic soils and increased with the increase in soil temperature. The sudden increase in soil moisture greatly stimulated N2O emission from the ithogenic the changes of land use have an important effect on N2O fluxes from the ithogenic soils. In addition, the N2O fluxes at the different sites showed high spatial variations. The fluxes were positively correlated with the concentrations of NO3 , PO3-4 and Mn in the soils. The negative correlation between the fluxes and total S concentration in the ithogenic soils was also found for the first time. Coastal soils or sediments constitute an important source of global atmospheric N2 O and the increases in nitrogen loading from seabird guanos will lead to significant increases in the flux of this atmospherically active gas.