Abstract: All-vertical-piled wharf is a new type of high-pile wharf suitable for offshore deep seas， but its failure mode is quite different from the traditional type. The failure mode， earth pressure on piles and the bending moment along piles have been studied under wave loads and impact loads by use of FEM， and the applicability of m method， P-Y method and NL method for the all-vertical-piled wharf is verified. The analysis results show that in the horizontal limit state， plastic failure of the pile body is the key to the buckling damage， and the maximum bending moment along the piles reaches the ultimate bending moment. On this basis， the horizontal limit bearing capacity of structure has been calculated using simplified calculation methods. By comparison， m method is in good agreement with that given from FEM under small displacement conditions， P-Y method and NL method are in good agreement with that given from FEM in both large and small displacement conditions， and the simplified calculation method of safety coefficient through the ratio of the ultimate bending moment to the maximum bending moment along piles under design load is reasonable.