Slip　the　hip　is　one　of　the　movement　characteristics　of　Shadowboxing　which　plays　a　vital　role　for　the　Tai　chi　enthusiasts　relaxing　waist　and　sinking　the　breath　to　the　dan　tian.　It　can　also　communicate　the　up　and　down　parts　of　body,　and　support　the　external　force　during　pushing　hands.　In　this　paper,　a　Taijiquan　athletes’　attitude　of　slip　hip　and　cock　hip　were　recorded.　By　analyze　these　data　using　the　software　AnyBody　and　Ansys　that　is　famous　for　human　body　kinematics　analysis　and　finite　element　analysis,　a　conclusion　was　drawn.　The　pose　slip　the　hip　is　twice　of　pose　cock　the　hip　in　output　force　of　erector　spinae　which　can　equably　supports　the　waist　and　meets　the　requirement　of　Shadowboxing.　It　also　reveals　that　the　pose　slip　hip　is　3　times　of　the　pose　cock　hip　in　pressure　bearing　and　force　transmission　which　is　important　for　stimulate　the　concentrated　force　of　Tai　Chi.　©　2018,　Springer　International　Publishing　AG.