According to the actual situation of the fact that Shanghai 7th Metro lines get through from beneath Shanghai 2nd Metro lines,the model built by the ANINA program is used to analyze the influence of the shield construction on the settlement of the existing Metro.Through the comparative analysis of the different influencing factors,it is found that the different stress release rates which result from more digging soil,not timely stitching segment and not timely grouting and so on greatly influence the settlement of the sewer.