In this paper, the patent search service is based on the patent textual relevance information of the actual application requirements. In depth study of the Lucene full text retrieval tool kit and related technical basis,we extend the Lucene segmentation module,and improve the ordering algorithm Lucene by default, so that the patent text retrieval system designed in this thesis retrieval can support multiple patent document format which is commonly used, and eventually patent information retrieval system used in this study above, can effectively improve the performance of patent related retrieval system.