Because actual soil body, especially pollution soil has the complex geotechnical conditions and non-uniformity character, the conventional methods are limited to solve the foundation bearing capacity pressure. The paper proposed an analysis flow of pollution soil foundation bearing capacity evolution, and proposed the numerical test method for pollution soil body combining Fast Lagrange numerical method and limit analysis theory, which utilizes the power ability of numerical simulation and has good flexibility to complex foundation. Using the method to execute a simulation for the pollution soil body of certain sulfuric acid factory, obtained the visual destroy process and got the foundation bearing capacity accurately. And the foundation destroy mechanism is also revealed. The numerical results stated that the proposed method is a good mean to analyze foundation bearing capacity for pollution soil body which has good application prospect.