Open excavation of deep foundation pit is a relatively economical and simple construction method to meet the main construction conditions of ship lock at present,and the instability of foundation pit slope after excavation is a hidden danger of safety that should be paid attention to in the construction process.Therefore,the adoption of accurate,timely and reliable slope stability monitoring and implementation technology is the prerequisite to guarantee the safe construction environment.Based on the scale and shape characteristics of deep foundation pit excavation project of Dayuandu shiplock,the technical requirements and methods of slope deformation monitoring for deep foundation pit excavation are summarized.