With the extensive application of wireless equipment, electronic warfare is gradually becoming the key to winning modern warfare.Improving the anti-reconnaissance performance of radar has become an important means to enhance radar electronic countermeasures.The design of anti-sorting signals can enhance the anti-reconnaissance capability of radar fundamentally.Aiming at the algorithm of sequential difference histogram, which is widely used in the field of signal reconnaissance, the anti-sorting signal is designed from the perspective of destroying the estimation of signal Pulse Repetition Interval (PRI) by the sorting algorithm.Firstly, the operating steps of the sorting algorithm of sequential difference histogram are summarized, and the key steps of signal sorting by the algorithm are analyzed.Then, the signal design scheme is proposed.Finally, simulation verification is carried out.The simulation results show that the designed signal can effectively counter the sorting algorithm.