Abstract: In this paper, the sediment of Changli Gold Coast Nature Reserve is taken as the research object, and the relationship between the distribution of nitrogen forms and the median grain size and organic matter in the sediments of the reserve is analyzed. The results showed that the total nitrogen (TN) content in the sediments of the marine reserve was ranged from 180.13×10^-6 to 966×10^-6, with an average value of 638.15×10^-6. The content of non-transformed nitrogen (NTN) ranged from 75.82×10^-6 to 856.28×10^-6, and the content of the transferable total nitrogen (TTN) that was truly involved in geochemical cycle was between 104.31×10^-6 to 165.12×10^-6. The proportion of TN in each extractive nitrogen was WAEF-N (61.69%) > SOEF-N (20.38%) > IEF-N (15.40%) > SAEF-N (2.53%). The distribution characteristics of nitrogen in the sediments were mainly related to the input of terrestrial nutrients, the direction of ocean currents and the hydrodynamic conditions of the oceans. The distribution of organic matter and grain size in sediments had little effect on the distribution of the extracted nitrogen content. Compared with the existing statistical data, there was no pollution in the sediments basically.