Plate　anchors　have　been　increasingly　used　to　provide　a　mooring　system　for　offshore　floating　facilities　due　to　their　relatively　high　efficiency　and　low　costs.　The　analysis　of　anchor　behaviour　can　be　usually　divided　into　two　categories　＂immediate　breakaway＂　and　＂no　breakaway＂,　which　correspond　to　the　＂vented　anchors＂　and　＂attached　anchors＂.　Most　of　the　previous　literatures　focus　on　these　two　extreme　cases:　vented　anchors　in　clays　without　weight　and　attached　anchors.　However,　the　vented　anchors　in　clays　with　weight,　as　a　most　common　state,　are　in　the　intermediate　state　of　the　two　extreme　cases.　At　the　cases,　the　change　law　of　the　pullout　capacity　of　plate　anchors　with　embedment　depth,　inclination　angles　and　overburden　pressure　is　relatively　complex　and　needs　further　study.　This　paper　investigates　the　pullout　behaviour　of　inclined　strip　plate　anchors　in　clays　with　linearly　increasing　shear　strength　by　performing　a　series　of　finite　element　analysis,　and　clarify　the　change　law　of　the　pullout　capacity　and　the　failure　mechanism　of　plate　anchor　in　the　intermediate　state.　Two　new　formulas　are　proposed　to　predict　the　pullout　factor　for　inclined　vented　and　attached　anchors.　Related　research　results　can　provide　a　reference　for　the　engineering　design　of　inclined　plate　anchors　in　undrained　clay.