Since the foundation soil bearing layer of the proposed open-pit coil steel yard is deep silt and silt soil,the vertical and lateral displacement caused by the large-area coil steel surcharge loads will seriously affect the safety and use of RMG pile foundation.Therefore,it is necessary to treat the foundation soil.The method of finite element numerical analysis is used for analyzing the effect of large-area coil steel surcharge loads on the RMG pile foundation under the following three conditions:without treatment,mixing cement pile treatment and loading preloading,and the stress and deformation of pile foundation under three conditions are obtained.Based on the comparative analysis from multiple aspects,we determine the proper foundation treatment scheme for this site.