Aiming at the support of a deep foundation pit in Macau,a numerical model of asymmetric excavation of deep foundation pit is established by using finite element software to simulate the excavation process of foundation pit,and the effect of local excavation of foundation pit on stress and strain of support structure is analyzed.The results show that the local excavation of deep foundation pit has a great influence on the overall stability of the foundation pit,and can affect the distribution of the axial force of the internal bracing system,but has little influence on the maximum bending moment of the supporting pile.The research can provide guidance for the selection and design of supporting structure under the condition of partial excavation of deep foundation pit,and the balance of safety and practicability economy of pit-in-pit in deep foundation pit.