For a structure, if the bearing capacity of the foundation is insufficient, precast or casting piles are generally used. For the foundation consisting of whole vertical piles, the horizontal bearing capacity of the pile is influenced by many factors. Based on the analysis of the results of an example, this paper gives a list of the influential factors and corresponding weight to the horizontal bearing capacity. Furthermore, the characteristics of different connection modes of pile tops and relevant applying circumstances are also given, hoping to serve as a reference for the design of whole vertical-pile foundation.