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A simulation of UWB impulse signals propagation within an indoor non-line-of-sight (NLOS) environment is addressed in this paper. The transmitter and the receiver are placed in two rooms respectively with a concrete wall blocking the line-of-sight (LOS) propagation path. The radiation pattern and the polarization pattern of transmitting/receiving antenna are modelled. The corresponding transient electromagnetic field transmitting through as well as reflected from the wall, the floor, the ceiling, the objects, etc. are calculated in time domain. The simulation results provide the space-time distribution of received pulsed field, which give more intrinsically interpretations for the mechanics of UWB impulse signals propagation in indoor NLOS environment.