Abstract: River and lake system is an important part of maintaining the natural ecosystem,and also an important support for social and economic development. The ecological connectivity engineering technology of river and lake water systems is an important way to make up for the shortcomings of ecological restoration projects. By elaborating on the connotation of river and lake system connectivity,the ecological connectivity engineering system of river and lake system based on the three-stream and four-dimensional ecological model is constructed,including vertical connectivity engineering technology,horizontal connectivity engineering technology and vertical connectivity engineering technology,and each engineering technology is specifically elaborated on for each connectivity dimension. The construction of the river and lake system ecological connectivity planning engineering technology system can provide a strong technical support for the national and water conservancy industry to carry out the work related to river and lake system connectivity.