Abstract: Based on the freezing project of 2# cross passage and pump house of Guangzhou Metro Line 7 Beijiao New Town station-Lintou station interval, the physical and mechanical properties test of frozen soil and the safety evaluation of frozen wall are carried out. The uniaxial compressive stress-strain curves of silty clay and silty fine sand frozen soil at -5 ℃, -10 ℃ and -15 ℃ are obtained, as well as the flexural strength of silty clay and silty fine sand frozen soil at -10 ℃. At -10 ℃, the average uniaxial compressive strength of silty clay is 2.63 MPa, the average elastic modulus is 82.93 MPa and the average flexural strength is 2.384 MPa. At -10 ℃, the average uniaxial compressive strength of silty fine sand is 3.22 MPa, the average elastic modulus is 49.3 MPa, and the average flexural strength is 2.048 MPa. The first principal stress, shear stress and displacement of the frozen wall of the cross passage section and the pump house are simulated by using ANSYS software with the physical and mechanical parameters of the frozen soil. The safety factor of the frozen wall meets the requirements after the excavation of the cross passage, which ensures the safety and reliability of the underground excavation construction process.