Delay forwarding deceptive jamming is an important jamming method in the light of the inverse synthetic aperture radar (ISAR) imaging. In order to counter the false target caused by jamming, an ISAR deceptive jamming recognition and elimination method is proposed based on orthogonal pulse diversity. Firstly, a jamming signal model of ISAR is established, and the constraint conditions of orthogonal pulse design for this jamming are studied and given. A group of semi orthogonal pulses are designed to eliminate and identify the delay forwarding deception jamming. This method can detect and eliminate the false target caused by delay forwarding jamming by orthogonal design of inverse synthetic aperture radar waveform, and achieve the corresponding antijamming of inverse synthetic aperture radar. Finally, through the simulation experiment, the sidelobe waveform with 0.3 times the peak value is generated under the condition of 20 dB interference signal ratio, and the ISAR image is successfully obtained. At the same time, the existing methods being compared with high signal to noise ratio of more than 5 dB, the peak signal to noise ratio of ISAR image is improved by about 5 dB, and the method is valid