Abstract: This paper introduces a retaining project of deep foundation pit.Around the pit there are many buildings with different characteristics such as newly built or already existed,for temporary use or for permanent use.The surrounding environment and the geological condition are complex,the pit-depth veries from 9.0 m to 16.0 m.Limited by the constraints such as the duration and the construction arrangement,the shallow part of the foundation must be constructed prior to the deeper parts.According to project goals on security,economic and duration,the combined method of the soldier piles and the composite soil nailing wall was adopt.The actual construction and the monitoring result shows,the combined method meet all the requirements,and may provide useful reference for the similar projects.