Peripheral　rock　large　deformation,　shotcrete　crack,　steel　frame　distortion　and　other　phenomenon　of　destruction　often　appear　in　the　tunnels　with　soft　rock　and　high　geostress　due　to　the　high　pressure　on　the　primary　lining.　The　safety　of　tunnel　during　construction　and　long-term　operation　will　be　affected.　Taking　Baozheng　tunnel　along　Yiwan　Railway　as　engineering　background,　based　on　statistical　analysis　of　in-situ　monitoring　data,　mechanical　characteristics　of　surrounding　rock　pressure,　stress　of　shotcrete　and　steel　arch,　axial　force　of　bolts　and　deformation　distribution　of　deep　seated　rock　have　been　analyzed.　Development　law　over　time　and　spatial　distribution　along　the　tunnel　ring　of　the　above　test　items　are　discussed.　During　the　excavation　in　the　tunnel,　rock　pressure,　steel　arch　stress　and　shotcrete　stress　change　rapidly,　and　sensitivity　decreases　in　turn　with　the　character　＇upper　larger,　lower　smaller＇　along　the　tunnel　cross　section.　The　analytical　method　and　results　can　provide　references　to　accurately　understand　the　support-surrounding　rock　interaction　and　their　mechanical　characters.