This　paper　presents　a　novel　connecting　plate　for　achieving　a　flexible　connection　in　a　soft　manipulator.　The　main　material　used　in　the　connecting　plate　is　silicone,　which　functions　similarly　to　the　bionic　oblique　muscle　(BOM)　of　an　octopus　arm　and　takes　over　the　two　actuator　segments.　Each　segment　of　the　actuator　consists　of　three　chambers,　and　the　chambers　are　assembled　with　the　connecting　plate　via　bolts　and　loops　to　be　a　manipulator.　By　using　a　flexible　plate　instead　of　a　rigid　one,　the　manipulator　achieves　more　dexterous　movements.　This　paper　establishes　a　nonlinear　model　for　analyzing　the　shear　and　compression　deformation　of　a　silicone　connecting　plate.　Additionally,　finite　element　method　was　used　to　analyze　the　mechanical　performance　of　the　connecting　plate.　The　deformation　of　a　soft　material　can　reduce　the　stress　concentration　during　movement　of　the　manipulator.　Therefore,　in　the　experiment,　the　BOM　exhibited　better　motion　performance　compared　with　the　rigid　connection　plate.