Abstract: The paper proposes a detecting method of multiple moving targets in stepped-frequency radar based on time-dechirping, in order to solve such problems that conventional processing methods without velocity compensation will reduce the detection performance because of range profile distortion and that velocity compensation methods cannot detect multiple targets with different velocities. This method performs the time-frequency transform processing for echo of all sub-pulses, and then the target parameter estimates value is obtained by two-dimensionally searching the processing products. The paper also describes the principle of detection and formulates the mathematical expressions of velocity resolution and cross-term peak strictly. Simulations for multi-moving targets are employed to validate the method.