Contents of water soluble organic carbon (WSOC) of 19 soil samples collected from the eastern part of China were determined and the spatial variation in WSOC were analyzed by means of trend surface and semevariagram analysis.It was found that WSOC contents in the studied samples ranged from 0.008 to 0.379mg g^-1 C with a median of 0.159mg g^-1 C.There is a decreasing tendency of WSOC content from NNE to NNW.Fulvic acid is one of the main sources of WSOC and pH plays an important role in WSOC accumulation in soil.