Black carbon (BC), an important component in the inert carbon pool of soils, represents an appreciable sink of carbon in the global carbon cycle. The objective of this study was to investigate the distribution of BC from soil fractions in Chinese fir plantation. The results indicated that the contents of BC in light fraction (LFBC) and heavy fraction (HFBC) ranged from 0.05 to 0.64 g/kg and 0.23 to 1.09 g/kg respectively. The proportion of LFBC to BC varied from 12.9% to 37.5%, whereas that of HFBC to BC ranged between 62.5% and 87.1%, which indicated that the BC was mainly present in the heavy fraction. However, the LFBC/LFOC and HFBC/HFOC ratios were 4.0% ~ 27.9% and 6.5% ~ 8.9% respectively, which indicated that BC was an important constituent of C pool in light fraction.