The digital multi-delay smart jamming based on Digital Jamming Synthesis(DJS) is proposed in order to improve the jamming capability against pseudo random code phase modulation fuze. This method could improve the effectiveness of jamming against the pseudo random code phase modulation fuze. Theoretical analysis and experimental research demonstrate that this method can produce multiple false targets with different time delays, which has both deception and blanket jamming effects. This method can make the jamming frequency in accordance with the frequency band of fuze, and the jamming signal can acquire pulse compress gain of fuze. It can make use of the jamming energy efficiently.