Several　construction　decisions,　including　reasonable　construction　plan,　tunneling　parameters　and　building　reinforcement　measures,　may　be　made　by　analyzing　and　evaluating　building　settlements　induced　by　shield　tunneling　in　close　proximity.　Based　on　a　project　of　No.2　line　of　Shenzhen　subway,　characteristic　settlements　of　the　buildings　were　simulated　and　analyzed　with　software　of　FLAC　3D.　The　characteristic　settlements　of　the　buildings　were　also　investigated　by　in-situ　monitoring,　and　the　effects　of　geology　conditions　and　foundation　types　on　the　settlements　were　simultaneously　studied.　Results　show　that　the　settlements　will　increase　rapidly　when　one　tunnel　is　being　tunneled　under　the　buildings　by　the　shield　machine　and　there　will　be　an　obviously　secondary　settlement　when　the　other　parallel　tunnel　being　tunneled;　the　secondary　settlements　will　be　also　affected　by　the　location　relation　between　the　tunnels　and　the　building　foundations;　and　the　settlements　will　be　much　larger　when　the　tunnel　section　consists　of　weak　rock　than　they　will　be　when　the　tunnel　section　consists　of　hard　rock.