To improve the living and ecological environment, the planning of large -scale public land such as parks is often dynamic, including the construction or demolition of landscapes like rockery in the park. For sub- way shield tunnel under the area, the overburden changes during the operation phase will make the structure cross-section deformation too large. Therefore, there is a conflict between the follow-up construction plan and the structural safety of subway shield tunnel. To solve this problem, it is necessary to reinforce the foundation in the construction period of subway shield tunnels. Through engineering investigation, the deformation of the cross-section of the shield tunnel in Shanghai Subway was analyzed. The ABAQUS three-dimensional finite ele- ment method was adopted to analyze the section of the deep silty soil in some typical soft soil area which was influenced by construction and crossing of soil layers on consolidation width of foundation in park area. The re- search results show that the foundation reinforcement should be considered in sections and the height of the mountain should not exceed 3.5m. The 3-meter-wide reinforcement for both arch sides is appropriate; through silty fine sand layer, the width can be reduced to 1m; through the silty clay layer, both arch sides do not need reinforcement.