The Liujiang Class Ⅱ waterway is an important part of the northbound route of southwest water transport to the sea，but the transportation capacity is insufficient.The feasibility study on the construction of the Liujiang Class Ⅱ waterway is carried out according to the distribution of natural resources of regulation river reach,the current situation and planning of social and economic development and industrial layout,and shipping development prospect.The design standards and principles of the Liujiang Class Ⅱ waterway are built.A method for calculating the size of the waterway are proposed according to the navigation rate and the class of the waterway,and the flow of Liujiang Class Ⅱ waterway is calculated on the basis of the minimum navigable water level and the stage water level-flow of the river section.The beach section waterway route scheme is proposed to realize the construction of a total length of 170 km and 2，000-ton level of Class Ⅱ waterway according to requirements of the bending radius of the Class Ⅱ waterway and the convenience of use and maintenance,inview of the freight volumes in 2025,2035 and 2050 are 26.7 million tons,48.1 million tons and 65 million tons respectively.