Promoting scientific and standardized registration of urban underground space has positive significance in promoting rational development and utilization of underground space resources and safeguarding the legitimate rights and interests of underground space rights holders. In this paper, on the basis of analyzing present condition of registration of urban underground space in Ji'nan city and Qingdao city, combing with practice of domestic and international legislation on underground space, rationalization suggestions for urban underground space property rights confirmation and registration work have been put forward. Through clarifying the scope of underground space ownership, promoting rights based registration, resolving conflicts of underground space rights through classification, exploring three-dimensional real estate registration, and regulating registration behavior. The resolution of related disputes will be improved, and the efficiency of underground space utilization in Shandong province will be promoted.