<p>Copper–tungsten (CuW) contacts face harsh and complex service environments such as high-temperature wear, arc ablation, and extrusion deformation during ultra-high-voltage power transmission. CuW composites are synthesized via in situ aluminothermic coupling with magnesiothermic reduction. The microstructure uniformity of CuW composites have been evaluated, and the three-dimensional morphology and particle size distribution of the extracted tungsten particles in the CuW composites were observed. The effects of the WO₃ size, additive NaCl, and the mixing method on the microstructure of CuW composites have been studied, and the results show that, with a decrease in WO₃ particle size, the average particle size of tungsten in CuW decreased from 1.22 μm to 0.92 μm, and the microstructural uniformity of CuW increased from 67.93% to 72.64%. The addition of NaCl was beneficial for the refinement of the tungsten particles and homogenization of the CuW microstructure. With the NaCl additions increased, the average size of tungsten particles in CuW decreased from 1.41 μm to 1.23 μm, and the microstructural uniformity increased from 68.78% to 71.68%. Ultrasonic premixing promoted mixing of CuO and WO₃ particles and dispersed tungsten particles in CuW, the uniformity of CuW microstructure increased from 67.98% to 73.55%.</p>