Abstract: Foundational research work of digital phase array radar is developed in this paper. Principle of transmitting multibeam is expounded. The schematic diagram of measurement system is presented, and characteristics such as VSWR and beam of antenna array are tested. The results of measurement are in good consistence with those of simulation, which confirms the correction and feasibility of transmitting multibeam.It is helpful for the technical support of the development of digital phase array radar to realize multifunction(radar/electronic interference/communication) with the same aperture.