Abstract: The UWB radar is a promising technique in fire rescue operations, police awareness, urban-warfare, life-threatening and other fields for noncontact measurement of the tracking and imaging of moving persons behind walls. Based on the UWB short-pulse through-wall radar, a strategy of the topology of the MIMO array is illustrated and the modified Kirchhoff algorithm is applied to slow-moving persons real-time imaging using a simple but effective imaging procedure. A video-like radar image with 5 Hz imaging rates is provided. Simulation results indicate that the topology of the MIMO array is useful for the through-wall radar system. The laboratory experiments are conducted to validate that the proposed imaging procedure is feasible and effective for slow-moving persons real-time imaging. The reasonable moving target trajectory can be obtained after the tracking and filtering process using the imaging results.