Traditional keywords retrieval didn' t understand the requirement of users, which is a process of simple matching. The results of keywords retrieval usually include much need- less information, meanwhile, some information the user needs are neglected. To make up for the deficiency of keywords retrieval, semantic retrieval is proposed,which is a hotspot in the application of building information retrieval system. Taking the materials corrosion information of Gas Network as example, this paper introduces a semantic retrieval system based on GIS ...