By use of the partial differential equation, a three dimensional PDE model is established for the determination of the mercury polluter source in the surface soil. The diffusion equation is worked out by performing regression on the collected data and thus the maximum point of the equation is obtained, which is the final center of the polluter source. The said meth- od not only enhances the accuracy by 1.5 %, but also helps acquire the concentration distribution function of mercury pollution in the region.%利用偏微分方程建立了一种确定土壤表皮汞污染源的三维扩散偏微分方程模型．通过对数据进行回归得到扩散方程，从而确定污染源中心．该方法不但使污染源确定精度提高1．5％，而且得到了该地区汞污染浓度分布函数．
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