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The mechanical behavior of shield tunnel during approaching excavation has become a common and important problem.The excavation of obliquely undercrossing tunnel was simulated in three-dimensional model by finite element software, and internal force and deformation before and after taking different strengthening stratum thickness were comparative analyzed.The conclusions are as follows:excavation of the newly-built tunnel have little impact on the x-direction displacement of the existent tunnel, and the largest subsidence of the existent tunnel is located at the arch bottom; the undercrossing tunnel has the most apparent impact on the bottom arch of the tunnel, and the impact gradually decreases from bottom arch to vault, while the largest impact occurs at the bottom arch and the smallest impact occurs at vault; the stratum strengthening significantly reduces the settlement of the existent tunnel.