The pre-stressed high strength concrete pile (PHC) is widely used because of its multiple advantages. In this paper, PHC tube pile was utilized to reinforce soft soils in a large water gate. Three different piles forms were proposed according to different pile length, diameter and spacing and three-dimensional finite element models were established respectively, the calculated results of which were then analyzed to give a most reasonable pile form. The outcome provides a feasible method for soft soil ground treatment in this project, it’s also of reference value for other similar situations. At the end of the paper several construction attentions of PHC tube pile were noticed.