A 2D numerical flow model based on the latest dry season topography is established after analyzing the flow and sediment characteristics and the deepwater navigation channel condition of the Hechangzhou waterway.The increase of the diversion ratio and the velocity in the right branch which represents the effects of many engineering measures from different regulation schemes are calculated.According to the results,the regulation effects and advantages/disadvantages of different regulation measures are compared.Finally,this paper clarifies that constructing two submerged dikes located at the upper section of the right branch should be the leading idea to regulate the Hechangzhou waterway channel.The conclusion can be the reference for construction of 12.5 m deepwater channel.