A soil incubation experiment was conducted to investigate the effect of corn or rice straw addition on CO₂-C release and pollutant removal in polycyclic aromatic hydrocarbons (PAHs) contaminated soil, and examine the relationship between soil dissolved organic carbon (DOC) and PAHs degradation. The results show that the release of CO₂-C is increased by straw added treatment in PAHs polluted soil, and the effect of corn straws is better. Soil DOC concentration is significantly increased by straw supplement, and the increase amplitude is further improved by the increasing level. Compared to corn straws, rice straws cause the higher level of soil DOC. Meanwhile, soil residual PAHs concentrations are significantly decreased by straw added treatments compared with CK, and the removal rate of pollutants is correspondingly increased. The removal efficiency follows as:corn straw better than rice straw, high addition rate better than low level, phenanthrene better than pyrene. Compared to CK, the removal rate of phenanthrene and pyreneare respectively increased by 91.7% and 182% with high level of corn straw addition. In addition, soil DOC concentration is positively correlated with the removal rate of PAHs in a certain range. Consequently, high addition amount of corn straws can promote soil organic carbon mineralization, increase soil DOC concentration and the degradation of PAHs in PAHs polluted soils.