Abstract: The estimation of the pulse edge had always been an important subject in the field of radar and electronic reconnaissance, and the results directly affected the extraction of radar features. In this paper, an edge estimation method based on phase information was proposed for the case that the received pulse was unknown and the envelope of the pulse was nonuniform. In this method, the signal segment and the noise segment were distinguished by the standard deviation of the phase of the received signal, then the rough estimate of the pulse was obtained. Then, the method used sliding window detection for the rough estimate, and then the exact edge estimate of the pulse was obtained. The theoretical analysis and simulation results show that the proposed algorithm which has the characteristics of small computation and high precision can effectively solve the problem of pulse splitting in traditional pulse edge estimation methods.