Abstract: The industrial reduced tungsten powder with a particle size of 3-5 μm was modified by low-energy ball milling, airflow crushing, and radio frequency plasma spheroidization technologies. The modified tungsten powder was used as the raw material, and the metal injection molding (MIM) technology was applied to prepare the porous tungsten matrix for barium-tungsten cathodes. The influence laws of different modification processes on the properties of tungsten powder, the rheological characteristics of the feedstock during the injection process, and the characteristic parameters of the pore structure of the finally prepared porous tungsten matrix were systematically studied. The research shows that the tungsten powder processed by airflow crushing (ACW) and the tungsten powder prepared by radio frequency plasma spheroidization technology (SW) exhibit the characteristics of a narrower particle size distribution, smooth particle surfaces, and better powder dispersibility. When the same binder is used, the feedstock prepared from ACW and SW powders has a higher powder loading. The porous tungsten matrix prepared from ACW and SW powders can meet the basic requirements of barium-tungsten cathodes, and it has a low closed pore rate, better pore connectivity, and a more uniform pore size distribution.