Maintaining the ecological connectivity of river and lake systems is conducive to the health of river basins. The choice of connectivity schemes affects the effective connectivity of river channels and the extent of how their functions are played. In order to find an optimal scheme accurately and efficiently, based on the theoretical definition of river system connectivity, the river layout and connecting platform for planning (RLCPP) with three layers, three libraries and three modules was developed to optimize the connectivity path of river and lake systems. The platform is the integration and combination of the support layer, function layer and interaction layer, of which the support layer is consisted of the database library, model library and case library (“three libraries”). This platform integrates the optimization analysis of water system connectivity planning schemes, integration of water quantity-water quality-ecology coupling analysis models and management of river-lake water system ecological connectivity case library into three functional modules based on the key technology of water system extraction and graph modelling. It is a new approach for the formulation and optimization of river network water system connectivity schemes.