The　lateral　launching　scheme　of　shield,　using　shaft　and　π　shaped　double-cross　channel,　is　adopted　for　Changchun　Metro　Line　2　between　Nanguan　and　Yanchang.　The　proposed　method　successfully　overcomes　the　problem　that　the　shield　launching　shaft　cannot　be　set　up　directly　on　the　truck　road.　CRD　method　is　applied　to　the　cross　channel　with　six　pilot　tunnels.　Relying　on　this　project,　the　ground　subsidence　deformation　characteristics　during　excavation　of　π　shaped　double-cross　channel　were　analyzed　using　field　measured　data,　theoretical　analysis　method　and　numerical　simulation.　The　research　shows　that　the　patterns　of　ground　deformation　caused　by　right　and　left　cross　channel　excavation　are　basically　the　same.　The　ground　subsidence,　which　starts　from　the　intersection　between　arc　segment　and　line　segment,　is　the　largest　and　is　always　beyond　30　mm.　The　area　of　the　section　is　about　four　times　of　the　tunnel　diameter.　More　than　85%　of　the　total　ground　subsidence　is　caused　by　the　excavation　of　the　first　four　pilot　tunnels(upper-left,　mid-left,　upper-right　and　bottom-left　pilot　tunnels)　and　the　stratum　loss　rate　increases　proportionally　along　with　the　increase　of　excavation　areas　of　the　cross　channel.　With　the　proceeding　of　the　last　two　pilot　tunnels　excavation(mid-right　and　bottom-right　pilot　tunnels),　the　stratum　loss　rate　gradually　decreases.　The　research　results　can　provide　reference　to　the　construction　and　can　be　adopted　for　similar　engineering.　©　2018,　Science　Press.　All　right　reserved.