Due　to　the　special　landform　and　physiognomy　in　the　mountain　highway　construction,　it＇s　often　necessary　to　excavate　of　road　cutting　in　a　complex　geological　environment,　including　high　and　steep　slope.　And　the　security　of　cut　slope　in　construction　has　a　deep　influence　on　the　normal　development　of　the　whole　project.　Whether　the　construction　of　high　slope　engineering　is　safe　or　not　depends　on　many　uncertainty　factors.　Generally,　the　sole　safety　factor　can＇t　deal　with　these　uncertainties.　Therefore,　in　the　course　of　construction　operation,　analyzing　and　assessing　the　risk　of　slope　engineering　to　avoiding　and　reducing　risk　is　substantial.　According　to　the　characteristics　of　the　slope　engineering　projects,　considering　to　the　experience　of　this　kind　of　project　management,　the　engineering　geological　conditions,　site　conditions,　the　height　of　slope　and　climate　conditions　were　chosen　as　the　overall　risk　assessment　indicators　of　high　slope　engineering　in　the　construction　safety,　and　demonstrate　the　rationality　of　selecting　the　indicators　in　detail.　Afterwards,　based　on　the　knowledge　of　probability　theory　and　mathematical　statistics,　the　scores　of　overall　safety　risk　of　construction　can　be　divided　into　four　levels,　then　evaluate　the　criticality　of　slope　construction　quantitatively　and　thereby　provide　scientific　decision-making　basis　for　different　risk　rank　of　slope　engineering　to　take　corresponding　risk　control　measures.　Furthermore,　the　special　risk　assessment　of　construction　safety　is　suggested　to　the　high　slope　engineering　whose　overall　risk　rank　is　level　III　and　over.　At　last,　based　on　Hubei　Yunshi　highway　which　is　being　constructed,　the　overall　risk　assessment　on　the　construction　of　cut　slope　engineering　was　made　and　suitable　evaluation　result　was　obtained.　Then　compared　with　the　actual　construction　situation,　found　evaluation　results　and　actual　situation　are　keep　in　coincide.　So　the　effectiveness　of　the　risk　assessment　system　is　verified.