Abstract: Unknown radar signal sorting is always a problem of radar countermeasure.So the paper proposes a new signal sorting method based on data potential field.The method can cluster signals based on the relevance of signal parameters and does not need to appoint cluster number in advance.This method can process mass of data without any prior knowledge and is not sensitive to the influence of noise.In the end computer simulation results show that the proposed approach can feasibly and effectively sort the radar emitter signals.