Nuclear power technology trajectory have a two-dimensional structure and multi-technology structure, respectively on the innovation embodied in improving-type along the technological trajectory, and revolutionary-type leaping technological trajectories or integrating-type merging technological trajectories. Technology innovation roadmap of nuclear reactor type trajectory is path diagram of evolution, interacting of market pulling and technology pushing, whose time node is task and goal of innovation link. The structure of technology innovation roadmap implanting technological trajectory of track structure provides the framework structure of roadmap for Chinese nuclear power technology innovation, and has an important guiding significance for developing specific nuclear reactor roadmap of technology innovation.