Abstract: The current research on coherent jamming of mono-pulse pulse Doppler(PD) seeker focuses on coherent dual point-sources jamming, which is based on the particle model to produce jamming signal. Accordingly, the simulation system to verify jamming efficiency is simplified to functional simulation. However, when the target under protection is an extended one, the jamming method based on particle model is invalidated. To solve this problem, a novel coherent jamming method based on extended target model is proposed. According to the 3D CAD model of ship targets, the high resolution range profile (HRRP) templates at full azimuth angles are calculated. The jamming signals coherent with echoes are by convolution HRRP templates to radar transmitted signals, which fully preserves target property modulation information on signal phase. In order to evaluate the effect, the PD seeker is discussed in six degree of freedom trajectory simulation of the closed loop (PDRS) for coherent video signal level. Experiment result shows that the proposed method has better angle deception jamming effect which produces the jamming signal by using target range profile to approximate target scattering function. The azimuth and elevation frame angle error can reach up to about ten degree level.