The data acquisition stage is mainly to formulate retrieval strategy, patent retrieval, retrieval strategy review and data processing. The quality of patent retrieval directly determines the success or failure of patent analysis. In order to improve the recall rate as much as possible, it is necessary to further refine the retrieval elements, expand the retrieval keywords for each retrieval element, form a preliminary retrieval strategy, conduct preliminary retrieval, collect sample data abstracts, and use patent analysis software to automatically classify sample data.