Abstract: Based on time domain the phase-oriented jamming, performance of tactical data links(TDLs)is studied, and the influence of jamming duration on jamming effect is quantificationally analyzed.The model of digital communication and phase-oriented jamming of TDLs is established,and the evaluation method of jamming effects based on time domain is presented.The simulation results show that the phase-oriented jamming of multitone is superior to the that of white noise.The research results helps to choose the jamming opportunity and jamming duration accurately.