Abstract: miniaturization and multifunction are the direction of the modern radar system. As the important technology of the broadband phased-array radar system, the technology of achieving instantaneous wideband needs further true time delay lines in the transmit-receive module. This paper put forward a delay line module working in Ka-band based on LTCC technology. Each delay line is composed by delay branch and equal loss branch, all delay line unit after cascade in sequence, through driving circuit control MMIC single-pole double throw switch path choice, can produce a minimum 1λ, step 1λ, the maximum 63λ time delay. Delay branch selected the material of Ferro A6-M, signal through the strip-line can realize components miniaturization and reduce the dispersion characteristics. Equal loss branch select the ceramic substrate. The final volume of the measured delay-line component is 84×47×15 mm3, and has excellent VSWR.