Abstract: Time domain planar near field scattering measurement is a direct and effective method. It has some advantages, such as wide frequency band, holonomic time domain scattering data, high space utilization and so on. In this paper, the technical architecture of time domain planar near field scattering measurement is illustrated. Based on the principle of time domain planar near field scattering measurement, the construction scheme of this measurement system is designed, and the feasibility is proved. The effectiveness of this system is proved by analyzing the actual measurement data and corresponding errors.