Carbonate aerosol is an important component in the atmosphere, which is mainly composed of organic carbon (OC) and elemental carbon (EC). OC includes both carbon components directly emitted from sources and secondary organic carbon which experienced complex processes, which are complex sources. And EC is mainly produced by the incomplete combustion of fossil fuels and biomass burning, which can be used as the identification marker of primary emission source. As is known to all, atmospheric deposition contributes several carbon components to the ocean annually, in which dissolved organic carbon(DOC) plays an important role in the biogeochemical cycle. At present, the research on the cycle of carbon mostly focuses on the water-soluble components and processes of transformation, and there is few research about OC. Therefore, taking the coastal city Xiamen as an example, we study the seasonal concentration change of OC with the help of characteristic markers, speculating its source. Buliding the relationship with air quality parameters, we may predict the change of OC simply.