| farmland topsoil sample of three counties around Nanchang city had been collected and 16 kinds of optimal control PAHs in soil were extracted and analyzed. PAHs in soil were extracted by soxhlet extract method and be separated and detected by an HPLC system. The data were analyzed by principal constituent factor load method to estimate the spatial distribution of PAHs and to investigate the possible contaminated sources.The result shows that 33.3% of the farmland soil of this area has been polluted slightly, the content of the top polluted sampling point is 422.8ng·g-1, the content of the bottom polluted sampling point is 75.2ng·g-1, the average content is 197.9 ng·g-1, and the vestigital level in farmland soil far from city is remarkably lower than those which is near the city. The characteristic of the component of PAHs is that they are mainly low cyclic compounds with low toxic level; those optimal control PAHs primarily originate from combustion of coal, natural gas and petrol.
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