Abstract: To analyze more deeply the impact of the foundation excavation process on the surrounding environment and structures, this paper set the foundation pit project of Guangzhou Pazhou Hong Kong-Macau Passenger Port project as an example to simulate and calculate the structural displacement of the under-construction subway shield tunnel and adjacent tram at the bottom of the foundation by using Midas GTS/NX software. The safety state of the tram and shield tunnel structures during the construction process was evaluated. The conclusions are as follows, the construction process has an impact on adjacent existing tram structures and subway tunnels under construction. The most unfavorable situation is in the extreme working condition at the parking place of the tram and subway’s left and right lines in the construction range of foundation pit respectively. However, each extreme displacement value does not exceed the allowable range. Thus, the pit construction process will not endanger the overall safety of the adjacent tram structure and subway tunnel.