In order to meet the large number of distribution terminal and fault indicator connected into distribution automation master station, a transient fault feature extraction method based on single-phase grounding fault recording wave and localization strategy of single-phase grounding fault and fusioning fault record fault feature and fault event information are proposed. A on-line single-phase grounding fault location system based on distribution automation master station is designed. In order to meet the engineering application, the solution of equipment mixing on site, communication delay and start-up condition absence is given and the unified processing strategy of fusioning fault information for single-phase round and short-circuit is presented. The application results in engineering field show that the single-phase grounding location system can meet the application requirements of various wiring modes and complex environment. This work is supported by Special Fund for Applied Science and Technology Research and Development of Guangdong Provincial Science and Technology Department (No. 2015B012128006) and Science and Technology Project of State Grid Corporation of China (No. 52020116000F).