Based　on　the　global　method,　an　approach　is　proposed　to　consider　the　effect　of　anchor　reinforcement　on　slope　stability,　where　equilibrium　conditions　are　formulated　in　terms　of　the　whole　slip　body.　Anchor　pre-tension　is　assumed　to　be　undertaken　by　the　whole　slip　body　instead　of　individual　slices,　causing　internal　force　within　slope　more　realistic.　Meanwhile,　the　optimization　model　for　locating　the　critical　slip　surface　is　of　weak　nonlinearity　and　easy　to　solve　using　the　conventional　optimization　procedures.　The　effects　of　anchoring　orientation　and　position　are　thoroughly　investigated,　and　interesting　results　are　obtained.