Based on the solutions of existing semi infinite soil ball hole expansion extrusion soil displacement, using the principle of sphere volume and the volume of a cylinder be equal, by linear elastic superposition method, the paper simulated the soil dynamic process of static pressure sinking pile penetration and got the simplified calculation formula of jacked pile soil displacement,and analyzed the elastic modulus and Poisson's ratio and other factors on the extrusion effect of soil displacement.These results indicated that the elastic modulus has an obvious influence on squeezing displacement of single pile jacked. With the increase of elastic modulus the,soil compaction displacement will Significantly decrease; The medium pressure pile in the hard soil will have a more serious damage to the surrounding buildings and pipelines. The effect of Poisson's ratio on soil compaction displacement is less, but the larger the Poisson's ratio, the larger the soil compaction displacement will be. The outcome can provide certain guiding significance for the design and construction of static piling under the condition of semi-infinite soil and the related issue of cavity expansion.