Combining　the　slope　geological　hazard　control　engineering　in　the　repairman　group　living　community　of　Changting　branch　of　Highway　Administration　Bureau　of　Longyan　city,　Fujian　province,　firstly,　the　shear　strength　indices　of　the　slope　soil　are　obtained　through　back　analysis　by　using　ABAQUS　program.　Secondly,　a　lot　of　real　large-scale　three-dimensional(3D)　finite　element　models　in　different　design　cases　of　anti-slide　piles　are　established　in　supercomputer.　Then,　the　relationships　between　the　safety　factors　of　soil　slopes　and　pile　lengths,　as　well　as　pile　diameters,　pile　spacing,　are　obtained　by　using　3D　strength　reduction　FEM.　And　the　bending　moment　diagrams　of　the　piles　are　also　obtained.　Meanwhile,　the　distribution　laws　of　earth　pressure　surrounding　the　anti-slide　piles　are　revealed.　It　is　illustrated　that　because　of　the　existence　of　soil　arching　effect,　there　are　differences　between　earth　pressure　surrounding　the　anti-slide　piles　and　that　with　laterally　crown　loading　piles　located　in　horizontal　strata.　At　last,　based　on　comprehensive　comparison　of　a　large　number　of　test　computation　cases,　the　optimal　design　case　of　anti-slide　piles　is　obtained.　The　method　can　be　for　references　in　the　design　of　anti-slides　piles　for　large　and　medium　scale　slopes(landslides).