This paper analyzes the morphological characteristics of Xinzhou confluence and features of within-the-year and inter-annual variation of the confluence shoal, and discusses the influential factors of the shoal appearing. It is concluded that the impact from the lockup of the south inlet’s confluence on the shoal does exist, but it’s not the major factor; The trend of the upstream deep trough of Xinzhou south inlet and the change of the north inlet’s incoming flow are the main reasons for the shoal appearing at the confluence. Based on the analysis, this paper investigates the regulation idea for the shoal regulation.