To study the effects of different fertilization on soil organic carbon, electrical conductivity (EC), pH value, bulk density and total nitrogen, an experiment was carried out at coastal saline soil of north Jiangsu Province. Results showed that, soil organic carbon content and density in 0?–?30 cm layers increased under all fertilizer schemes. Meanwhile, the application of farmyard manure, commercial organic fertilizer and inorganic nitrogen fertilizer increased crop biomass and yield significantly, improved mudflat farmland property. The application of all fertilizers decreased pH value and soil bulk density, increased soil total nitrogen content. However, farmyard manure and commercial organic fertilizer increased soil electrical conductivity (EC). SOC content has significantly positive correlation with EC, TN, C/N ratio and biomass (P<0.01), while significantly negative correlation with pH value and bulk density (P<0.01).