The design of pile foundation is the key point in the design of pile supporting wharves. The horizontal load of the normal pile supporting wharf is completely borne by the pile foundation，which leads to a large number of piles，large scale，and high cost. In view of the problem that the horizontal load leads to the increase of pile，we set the anchored friction plate support system at the rear of the wharf to bear the horizontal load，use the finite element calculation method to compare with the normal structure and reveal the mechanism and effect of the anchored friction plate support system. The results show that the anchored friction plate support system can greatly reduce the internal friction of the pile and the number of pile foundations，optimize the structure scale and save the project investment.