In order to understand spatial distribution characteristics of contaminant by polycyclic aromatic hydrocarbons (PAHs) in a hilly areal coking plant, 16PAHs' concentrations in soil were analyzed at coking plant of Shanxi Province which was about 106667 square metres and studied transition and diffusion regulation of contaminant, both horizontally and vertically. The results showed that:16kinds of PAHs in the surface soil were distributed in the production workshop, the concentrations of polycyclic aromatic in soil within superficial 0.0 to 0.5m depth ranged from ammonia benzene area (991.33mg/kg) to cold drum desulfurization area (406.50mg/kg) to sewage treatment area (97.69mg/kg). As for the source of polycyclic aromatic, high and low ring ratio method was used to classified calculate polycyclic aromatic monomers which proved that the group of M202, M228 and M252 was main component of polycyclic aromatic except for in certain percentage of M178, so the source of pollution was rather single source than mixed sources from combustion source and petroleum source which is mainly the product of burning and releasing, namely leakage and venting of tar. Vertically distribution of PAHs in different workshops was different which is closely related to the original engineering process and the stratum structural features in the contaminated area, and the pollution of cold drum desulfurization area was located on 3.0 to 4.0m depth, ammonia benzene area was 0.0 to 0.5m, however sewage treatment area was surface and 1.0 to 2.0m.