Abstract: Increasing gain and radiant efficiency is one of the most important aims of the research on trantrent antenna. The energy array factor of transient radiation was deduced by setting the Gaussian pulse feeding waveform. The transient radiation characteristic of one dimension, symmetrical, and uniform array was analyzed. The radiated waveform of array is correlated with observational time and angle, transient characteristic is quite different from that of transient-free, time domain pattern is correlated with pulse width, and time domain array is scannable. The dielectric loaded antenna array were designed and simulated by using 3D time domain electromagnetic simulation software. The front peak electric field of antenna with dielectric is two times of antenna without dielectric, and the effec