Taking the foundation pit project at Olympics Sport Center Station of Underground Stations along Lanzhou Rail Traffic as the example, the paper undertakes the calculation and research on the foundation pit dewatering parameter according to its features of weak foundation pit com-paction,uneven partical distribution,and insufficient pit stability,illustrates the requirements for the construction supervision,and points out the emergency treatment measrues,so as to ensure the safety of the foundation pit.%以兰州轨道交通地下车站奥体中心站基坑工程为例，针对基坑胶结程度差、颗粒分布不均匀、坑壁稳定性差的特点，对基坑降水参数进行了计算研究，阐明了施工监测的要求，并提出了应急处理措施，以确保基坑安全。
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