Large-scale water conservancy and hydropower development and construction projects have the characteristics of large land occupation,wide construction area,and large excavation volume of earth-rock,which will inevitably cause ecological impact during construction.How to reduce the adverse ecological impact caused by waste slag during construction is a challenge.With the ecological protection measures taken during the construction period of Mingjiang Longxikou Navigation Junction project as an example,the practical results indicate that measures including optimizing construction techniques,layout of construction areas,and construction processes during the construction period can effectively reduce the amount of waste slag.On this basis,this paper proposes ways for reducing and recycling waste slag,which can provide a reference for the ecological measures that should be taken during the construction period of other planned and under-construction navigation power junction projects in China.