The　change　rules　of　the　secondary　stresses　of　advanced　tunnel　segment　induced　by　parallel　shield　tunnels　dirving　in　close　proximity　are　studied　by　field　tests.　The　layout　of　the　measured　points　and　the　field　test　methods　are　introduced,　and　the　change　rules　of　the　secondary　stresses　are　analyzed.　Furthermore,　the　relationship　between　the　secondary　stresses　and　the　distance　of　the　shield　driving　face　to　the　measured　section　are　studied.　Statistical　analyses　of　the　maximum　and　the　stabilized　magnitudes　of　the　secondary　stresses　are　carried　out.　The　results　of　the　field　tests　show　that　there　will　be　sharp　change　of　the　secondary　stresses　when　the　hind　shield　is　driven　to　the　measured　section,　the　circumferential　secondary　stresses　in　the　intersection　of　horizontal　diameter　with　circumference　of　the　tunnel　will　be　laid,　and　the　magnitudes　of　the　circumferential　secondary　stresses　will　be　greater　than　those　of　the　longitudinal　secondary　stresses.　The　results　may　be　applied　to　the　quantitative　assessment　of　the　construction　interaction　of　shield　tunnels　in　close　proximity　and　is　regarded　as　references　to　the　design　and　construction　of　this　kind　of　shield　tunnels.