The　ground　surface　settlement　and　deformation　of　existing　tunnels　of　subway　stations　undercut　with　shallow　overburden　have　important　effects　on　the　construction　safety.　This　paper　introduces　the　processes　of　tunnel　excavating　of　the　Xidan　station　of　Beijing　subway　line　4　Xidan　station.　A　scheme　for　monitoring　structural　forces　is　drawn　up.　The　trends　of　structural　forces　and　rock　pressure　are　under　control,　and　the　reference　information　is　provided　to　judge　the　stability　and　safety　of　the　tunnel　by　monitoring　information　feedbacks.