By means of the comparative analysis method, the theories of PPP projects of water conservancy at the current stage in China are reviewed. With regard to the legal attributes of two stages, pre-stage of administrative behavior and post-stage of civil and administrative behavior, different solution schemes are taken through the legal procedures of “administrative litigation+civil litigation”. It is concluded that the mechanism of “administrative litigation+civil litigation”ismore conducive to the smooth implementation of water conservancy PPP projects and the solution to conflicts.