Abstract: The function and performance of the tantalum base oxide filament wrapped with plat-inum gauze are described briefly in the paper. The study on its discharge charateristics showes that the filament can operate stably and rehably with good performance,its discharge waveforms are flat and smooth with little oscillation. Its electron emission current density is over 6 A/cm² at 1100 K of operation temperature,four filaments of this type can produce 350 A discharge current with pulse duration up to 30 ms.