In　order　to　reveal　the　characteristics　of　water　gas　two-phase　seepage　in　soil　pores　and　explore　an　accurate　and　efficient　research　method,　this　paper　selects　undisturbed　soil　as　the　research　object,　and　establishes　the　three-dimensional　model　of　real　undisturbed　soil　samples　by　using　computer　tomography　and　image　processing　technology.　Taking　the　simulation　of　water-gas　two-phase　seepage　field　as　an　example,　the　role　of　computer　application　technology　in　soil　seepage　research　is　discussed　in　detail.　The　results　show　that　the　application　of　computed　tomography　and　image　processing　technology　can　better　realize　the　dynamic　visual　process　simulation　of　water-gas　two-phase　displacement　in　soil　pores　at　meso-scale.　This　research　method　enriches　the　existing　three-dimensional　reconstruction　simulation　methods　of　soil　mass,　and　provides　a　new　way　for　meso-pore　structure　and　fluid　seepage　research.