Abstract: The subarray configuration and the real time delayer design have a direct influence on wideband large phased array antenna in realization, such as the performance, the complexity and the cost. Based on the theory model of pattern synthesis, it is demonstrated that the multi-layer subarray design has the similar radiation characteristics as the conventional single subarray design. The application of multi-layer subarray design in one dimensional phased array shows that it can sufficiently decrease the complexity of system. Furthermore, the affection of subarray size and time delayer step to wideband phased array is analyzed and concluded.