Abstract：The stress field of soils will change and environmatal ground settle with excavition unloading of deep foundation pit. The seepage induced by lowering groundwater in deep foundation pit results in a seepage field and it could be described by flow net. The well-seepage theory and Dupit formula are applied. Over the flow profile buoyant unit weight of soil is changed to saturated one. Below the flow profile，the consolidation value of soil is incrased with permeable force. The seepage field is coupled with stress field，which is simulated by FEM. The value of ground settlement of foundation pit is acquired. Compared with a practical example，the calculated value is close to actually measured value for a deep foundation pit.
