Using coupling model, the time-effect behavior for deep pit during excavating and dewatering is studied. The distribution of the seepage field, the horizontal displacement of wall, the settlement of surrounding soil and the settlement of the road are all obtained from the coupling analysis. Taking the deep foundation pit engineering of one station as engineering background, the coupling of seepage and consolidation is simulated in the process of excavating. According to the comparative analysis between the simulation value and the measured results, it can be known that the calculation value considering the coupling of seepage and consolidation is well in accordance with the measured value. The analysis shows that the provide method can be used to simulate the deep foundation under the coupling effect and it is reasonable, feasible, and can provide some kind of references to design and construction.