Black carbon (BC) is an important pool of the global C cycle. However, very little is known about the effect of BC addition on soil labile organic carbon and native soil organic carbon. In the study, BC was produced by charring the rice straw under 350℃ and mixed with soil under different rates of addition levels (0, 1%, 2%, 3%, 4%, 5%), and incubated for 56 days at 25℃. The results indicated that soil easily mineralization carbon (Cm) increased with the increase of BC addition level, and soil microbial biomass carbon (MBC) content had the similar trend (exception for 3%). Dissolved organic carbon (DOC) content in soil showed no significant difference among the lower addition levels (1%, 2%, 3%), but it was obviously lower in BC amended soils (1%, 2%, 3%) relative to the unamended soils. Using natural 13C abundance method, the results suggested that BC addition inhibited the native SOC decomposition at rate of 1% BC addition, but stimulated the native SOC decomposition at rates of 2%, 3%, 4% and 5% BC addition. However, the effects of BC additions on the native SOC decomposition were not significant among different treatments.