The　unified　technical　standards　on　the　conservation　engineering　of　historic　buildings　and　sites　are　very　limited　in　the　world;　the　investigation　combined　with　geomechanics　and　conservation　methods　research　is　becoming　more　and　more　important　in　the　field　of　ancient　buildings　conservation,　especially　to　the　protection　engineering　of　landmarks　located　on　the　slopes.　This　paper　describes　the　damage　analysis　process　and　conservation　approaches　selection　to　the　West　Scriptures　Printing　Hall　of　Potala　Palace　in　Tibet.　The　structural　stability　and　possible　damage　under　gravity　and　earthquake　load　is　analyzed.　Rock　engineering　techniques　and　structural　analysis　method　are　applied　to　explore　the　bedrock　mass　properties　and　structural　characteristics.　The　main　three　factors　which　influences　the　stability　of　the　West　Scriptures　Printing　Hall　are　achieved,　such　as　heterogeneous　property　of　bedrock　mass,　stiffness　difference　of　the　structure　and　heterogeneous　distribution　of　structural　load.　Furthermore,　the　ground　stress　characteristics　in　the　bedrock　are　analyzed　and　the　mechanisms　of　deformation　and　foundation　subsidence　under　comprehensive　effects　of　the　main　three　factors　are　explored　by　numerical　simulation,　which　can　provide　a　lot　of　useful　experiences　on　the　conservation　engineering　of　landmarks　located　on　the　slopes.