Abstract：The deep foundation pit of Chaozhou hydro-junction is located at the river bed. The construction sequences are very complicated as a result of its large excavation depth，unfavorable engineering geologic condition，great difficulty of construction and tight time requirement. All these factors are considered in the optimal design and application of supporting system of diaphragm wall with reinforced concrete strut in the deep foundation pit. Excavation scheme is determined accordingly，which can satisfy the requirement of operation of large machines，reduce the construction cost and ensure the construction schedule. The date from monitoring is consistent with the design.
