Abstract: In the Wuyiling National wetland Nature Reserve of the Xiao Hinggan Mountains forest region,the soil samples of typical Sphagnum spp.wetland collected.According to the content of soil organic carbon(SOC),carbon density,carbon reserve,and the relationships between the SOC and the soil physical and chemical properties were analyzed.The results showed that the contents of SOC showed a reduction in a deeper soil stratum which range from 433.89 to 523.36g/kg,and is in a mean content of 474.27g/kg;carbon densities rise in a deeper soil stratum with a soil carbon density of 166.07t/hm² in the depth of 0-60cm.Secondly,the relation between SOC and soil capillary porosity was significant negative,quadratic curve-fitting results of which was well(R²=0.87);the SOC content is obviously negative correlated with soil bulk density,and the linear equation fitted was well(R²=0.81).The soil organic carbon content were significant negative correlation with total nitrogen and total phosphorus,in a obvious positive correlation with effective phosphorus,And organic carbon and hydrolysis nitrogen were not significantly correlated.The results may help us for further study.on wetland soil carbon storage and carbon cycle.