The central bar refers to the shoal located in the centre of the river. It is generally found in rivers with enlarged width and is very unstable with the stage fluctuations and changes in water and sediment conditions, which often results in very adverse impacts on the waterway conditions. In order to improve the waterway conditions, regulation projects of the waterway like the beach protecting project with soft mattress and the fish-bone dike project are absolutely necessary. This paper investigates different types of central bar protection projects based on two-dimensional mathematical model of water flow with unstructured triangular mesh method. The results indicate that the mathematical model proposed can capture the flow characteristics around the central bar very well, and further reveal the impact features of the central bar protection projects to the waterway flows which facilitates guiding significance to the regulation of the middle and lower reaches of the Yangtze River waterway with shoals and central bars.