The　mechanical　behavior　of　the　interface　between　soil　and　structure　is　the　key　to　determine　freezing　behaviors　of　pile　foundations　in　cold　regions.　In　order　to　explain　the　formation　mechanisms　of　adfreezing　strength　at　the　soilstructure　interface　and　explore　its　influencing　factors　and　changing　rules,　orthogonal　direct　shear　tests　and　orthogonal　tensile　tests　were　carried　out　under　various　conditions　of　moisture　content,　temperature,　and　dry　density.　Test　data　shows　that:　(a)　The　influence　of　moisture　content　and　temperature　on　the　shear　and　tensile　strength　is　significant,　while　the　influence　of　dry　density　is　not.　(b)　The　shear　and　tensile　strength　of　the　contact　surface　are　positively　correlated　with　the　absolute　value　of　the　temperature　and　moisture　content,　but　they　exhibit　different　growth　characteristics.　(c)　Under　the　same　test　conditions,　when　the　tensile　strength　is　less　than　100　kPa,　there　is　little　difference　in　the　shear　and　tensile　strength　of　the　contact　surface.　When　the　tensile　strength　exceeds　100　kPa,　the　tensile　strength　of　the　contact　surface　will　be　significantly　greater　than　the　shear　strength.　There　is　an　exponential　relationship　between　shear　strength　and　tensile　strength.　Based　on　the　experimental　results,　a　bond-friction　interface　model　which　confirms　the　reliability　of　the　model　in　simulating　the　mechanical　behavior　of　the　pile-soil　interface　is　established.　Research　results　clarify　the　mechanical　behavior　of　the　pile-soil　interface　at　low　temperatures,　which　can　provide　references　for　the　interactive　mechanisms　of　tapered　pile-soil　and　the　establishment　of　anti-freeze　models.