Through analyzing the test results of bulk density, particle size and organic carbon content of 42 sediments in two sections of Futuan river coastal wetland in central Rizhao city, characteristics and influencing factors of organic carbon storage in sediments in this area have been discussed. It is showed that organic carbon content of 0~100cm deep columnar sediments is 0.17%~0.72%, and the average value is 0.22%. The content of organic carbon in sediments of different wetland types is significantly different due to different habitats, which is expressed as shallow sea water>river beach>bare flat. The average carbon storage per unit area is expressed as shallow sea water>river beach>bare flat. The organic carbon storage of each wetland type is shallow sea water>river beach>bare flat. The total carbon storage of sediments at 100cm depth in Futuan Estuary natural wetland is about 11.24×104MgC. Organic carbon storage is obviously controlled by particle size and bulk density.