This　paper　presents　a　lateral　launching　scheme　of　shield　with　oblique-curve　shaped　(＂pi＂　shaped)　double　cross-duct　excavated　by　cross　diaphragm　(CRD)　method.　A　series　of　in-situ　tests,　theoretical　analysis　and　numerical　simulations　were　performed　to　obtain　the　displacement　characteristics　of　the　surface　and　the　underground.　Finally,　an　economic　comparison　of　the　traditional　scheme　and　the　proposed　scheme　was　conducted.　The　investigation　results　show　that:　(1)　The　change　of　the　tunnel　curvature　has　an　obvious　influence　on　stratum　stress　distribution　and　deformation　characteristics.　(2)　The　ground　loss,　surface　subsidence　and　horizontal　convergence　in　the　curve　segment　are　correspondingly　smaller　than　that　in　the　straight　section　and　the　arching　effect　is　also　more　easily　formed　in　the　curve　segment.　(3)　On　the　contrary,　the　curvature　change　has　little　influence　on　the　crown　settlement.　(4)　The　application　of　this　proposed　scheme　improves　the　efficiency　of　shield　tunneling,　with　also　economical　advantages.