Bangkok metropolitan located on thick river soft clay deposit has recently construction project on mass rapid transit underground railway (MRT). This paper presents a finite element study on the Bangkok MRT underground construction project. The Sukhumvit station construction was selected as the case study. The numerical study focus initial input of ground condition and the constitutive soil models. The geotechnical conditions were carried out based on soil investigation report. The parameters of constitutive models were determined and calibrated against the laboratory testing results. Finally, all finite element analysis results are compared with the real field investigations.