Abstract: In cooperate with Nuclear Power Institute of China, Changjiang Institute of Survey, Planning, Design and Research has completed the demonstration concept design research of underground nuclear power plant and proposed the underground nuclear power plant with independent intellectual property rights in China for the first time, and preliminarily formed complete sets of underground nuclear power plant technology. CUP600’s technical and economic parameters have reached the standards of the third generation nuclear power plant. This paper introduces the overall goal, technique route and research process of the research project of the underground nuclear power technology, and describes the setting of the key advisory project of underground nuclear power plant in China academy of engineering in detail with emphasis on the summary of the original and breakthrough achievements in the technology research stage.