Abstract: The working principle of time-delay lines in radar is introduced in this paper. The influences of time-delay phase accuracy and time-delay amplitude accuracy on signal synthesis are also analyzed. At the same time, the paper evalu- ates the difficulties of the miniaturization and high accuracy of the drive time-delay module, and proposes the design scheme of miniaturization realized by microwave multilayer printed circuit and high time-delay accuracy solved by the novel phase modulation and attenuation circuit. On this basis, a drive time-delay module is realized, integrating time-delay, amplification and power dividing/ combining. According to the measured results of each state of the drive time-delay module, amplitude fluctuation better than 依0. 4 dB, time-delay phase accuracy within ±5°and time-delay amplitude accuracy within ±0. 5 dB are achieved.