examined the measured excavation responses when the pit was excavated by the top-down method, including the deflections of the diaphragm wall, vertical column movement, slab axial force, building settlement caused by ground deformation, and the influence of pit excavation on the adjacent subway tunnel [16]. [PERSON] and [PERSON] investigated the behaviors of the pit under top-down construction in Shanghai soft clay [17]. [PERSON] et al. studied the effectiveness of deep cement mixing walls created using the top-down construction technique for a deep excavation, and found that the top-down construction method is more effective than the bottom-up construction method in terms of the limitations of lateral wall movement, the bending moment in a deep cement mixing wall, and the thickness of a deep cement mixing wall for various depths because of a larger system stiffness [18]. [PERSON] et al. simulated the construction process of the Zhongshan hospital project in Shanghai and found that the time effect of foundation pit deformation under top-down construction was particularly significant [19]. [PERSON] et al. found that the top-down excavation can effectively minimize the ground and building settlement, while the excavation may induce uneven displacement of the interior supporting columns [20]. Although the top-down method has many merits, it is difficult to remove the soils below cast ground floors due to the restricted head space, and soil removal cannot start until the poured substructure components have cured, which means that the top-down method requires longer time to complete an excavation than the bottom-up method [21]. Meanwhile, due to an excavation under the slab having low efficiency and creating a difficult environment for work, the cost of the top-down method is higher than the bottom up method. In response to some complex construction conditions and special technical and economic requirements, the covered semi-top-down method, which combines the traditional cover-cut method and the semi-top-down method, has gradually become a concern for the engineering community [22]. [PERSON] et al. found that the semi-top-down method has a good effect on controlling the surrounding deformation [23]. [PERSON] et al. investigated the performance characteristics of semi-top-down (STD) excavation for a subway station in Shanghai soft ground and found that spatial corner stiffening behavior was not apparent for this STD excavation because of the combined result of segmented construction procedure and narrow pit width, which is different from bottom-up and top-down excavations [24]. Compared with the top-down method, the covered semi-top-down method achieves flexible adjustment of the construction sequence of the structure inside the pit, which can save construction space, reduce construction costs, and improve efficiency. However, the mechanical characteristics of the surroundings under covered semi-top-down excavation with synchronous construction of the superstructure and substructure is still unclear, resulting in the need for an in-depth study. To improve our understanding of the mechanical response characteristics of the structure inside the pit and the surrounding environment during the construction process of the STD method, this article reports on a project in Beijing, involving a systematic study of the synchronous construction of superstructures and underground structures under a covered semi-top-down construction method. The construction process of the project was simulated using the software ABAOUS(r) 6.14, the mechanical response of the surroundings during the whole construction process were analyzed, and the interaction between the construction and the surroundings was explored.