In order to study the application effects of Beidou satellite measurement technology in the displacement monitoring for deep foundation pit construction, with an example of deep foundation pit project in Liuzhou City, the paper introduces the advantages of BDS system and conventional measuring method, the composition of foundation pit monitoring system, measuring points selection, monitoring methods and the effects. The research shows that GNSS technology, in which BDS is the key, can meet the requirements of accuracy and reliability, and is suitable for the displacement monitoring of foundation pit.