Batch experiment was performed to study effects of different aquatic factors (pH and iron intensity) on dispersibility of dissolved organic matter (DOM) extracted from Fulvic acid. It was found that the DOM extracted from fulvic acid (FDOM) remained high in dispersibility and did not precipate in solutions with pH between 2.0～7.0 and CaCl₂ concentration between 0～1 500 mmol L^-1 without precipitation. Column leaching experiments were conducted to investigate effect of FDOM on transport of polycyclic aromatic hydrocarbons (PAHs) in the soil. With continuous irrigation of FDOM, the concentrations of Phenanthrene (Phe), Pyrene (Pyr), and Benzo[a]pyrene (B[a]P) in leachate were significantly increased, and even a limited amount of Dibenzo (a, h) acenaphthene (DBA) was also detected in the leachate. After leaching, the leaching lost rate of Phe, Pyr, B[a]P and DBA in the surface soil was 92.06%, 92.07%, 84.52% and 23.27%, respectively. These findings indicated that FDOM could act as carrier facilitating PAHs transport in the soil, thus enhancing the possibility of PAHs moving deeper into the soil and ground water.