With the development of urban rail transit, the design of urban rail transit lines becomes more and more complicated due to the limitation of the original urban planning, as an important part of the connection between Main Line tunnel and vehicle section-access section line, the line design has more particularity, small radius, shallow cover soil and large slope seem to be synonymous with access section line. Under this kind of linear condition, the construction difficulty is big, the risk is high. However, in the construction of small radius of curvature, to a large extent, it remains in the qualitative level, and requires high experience of managers. Therefore, the study of quantitative construction technology of shield tunneling with small curve radius and good prediction in advance can effectively avoid the construction problems such as Axis overrun, segment dislocation and roof fall during shield tunneling.