Array weather radar (AWR) is a novel weather radar with high spatio-temporal resolution, which can detect the fine flow field and intensity field of severe convection weather by employing a distri-buted phased array technology and provide a new technology and instrument for researching the small-scale weather systems. A high-resolution intensity field fusion method is proposed in this paper. The resolution expansion factors for each azimuth and elevation direction are calculated, and the intensity is filled successively. The polar intensity field is converted to Cartesian coordinates, and the intensity field of different transmit-receive subarrays are fused. The objective evaluation of simulated small-scale severe convection detection is used to verify the performance of a proposed high-resolution fusion method. Through a case of real precipitation process, it is proved that 100 m intensity field fusion data obtained in this paper has a more detailed and complete echo structure.