Aiming at the problem of difficult parking in cities, the patent technology retrieval is carried out for the plane stereoscopic parking lot garage with the stereoscopic parking lot as the main research object. Establish a database based on the retrieved patent information, analyze the research on the patent classification and retrieval strategy of the plane and stereoscopic parking lot/garage through the theory of the solution of invention problems (TRIZ), and summarize the technology of the stereoscopic parking lot/garage and the overall development trend of the stereoscopic parking lot/garage. The results show that the research can provide technical support for solving the parking problem.