This paper introduced the engineering and hydrology geology conditions in Dianchi lake sewage main canal construction section,ac-cording to the engineering construction difficulties,discussed the design key points of foundation pit support,inner precipitation,drainage scheme,discussed the construction technology and control key points of“SWM construction method pile interpolation steel + Larsen steel sheet pile”combined support technology,and made monitoring to each construction effect,put forward emergency treatment measures,could provide reference for similar engineering.%介绍了滇池环湖截污干渠施工段的工程与水文地质条件，针对该工程施工难点，探讨了基坑支护、内降、排水方案的设计要点，论述了“SMW工法桩内插型钢+拉森钢板桩”联合支护技术的施工工艺及控制要点，并对各施工项目进行了监测，提出了应急处理措施，可供类似工程参考。
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