The influential factors of partition coefficient of horizontal impact force on overhead vertical wharf are complicated, which contain bent frame number, bent frame spacing, impact position, wharf width, components size and so on. This paper mainly studies the influence of wharf width and pile diameter using Ansys finite element analysis. The results show that increasing wharf width is beneficial to evenly partition coefficient of horizontal impact force. Increasing pile diameter is harmful to even partition coefficient of horizontal impact force. In order to make the structure well-distributed stress, it can be appropriate to increase the wharf width and reduce the pile diameter. This paper also contains the sensitivity analysis between the factors.