As the basic parameters of an earthquake，the reference place name of epicenter is the key geographical indication to understand the location of an earthquake，and the detailed reference place name is the clear direction of carrying out the work of rescue and intensity investigation. Using ArcGIS Engine secondary development component to develop a set of epicenter reference four-level place name query software，so as to quickly determine the four-level reference place names in Ningxia，make the relevant work carried out with more clear geographical location and target，and make the work efficiency significantly improved.
