Abstract: Space discharge is one of the important space stochastic pulse radiation source, and the electromagnetic signals it generates are the interference for frequency equipments such as communication and navigation. A detection system for space discharge radiation signals based on the narrow band test of radiation field is proposed. It consists of directional antennas, high transmission gain receive front-end and recording equipment. A location model of the space plane four-element arrays is built. The rapid search algorithm for space discharge radiation source is researched. And the location precision is tested by experiment. The results show that the system can detect space discharge radiation source within 1 km. the distance location error of space plane four-element arrays with 10 m size is less than 2.5%. The detection and location system can be applied to locating the space discharge source in complex electromagnetic environment, and it is significant for signals recognition and analysis with complex interference.