A series of hot extrusion tests were carried out for a novel powder metallurgy superalloy WZ-A3. The effects of extrusion temperature, extrusion speed, and extrusion ratio on the microstructure and the microstructure uniformity of the extruded bar were investigated. The results show that under the conditions of a constant extrusion speed of 35 mm/s, an extrusion ratio of 4.7:1, and an extrusion temperature of 1110 ℃, completely dynamic recrystallization of the extruded bar occurs. With the increase of the extrusion temperature, the grain coarsens. Under the conditions of a constant extrusion temperature of 1110 ℃, an extrusion speed of 35 mm/s, and an extrusion ratio of 2.1:1, the recrystallization is incomplete and there are more PPB left. When the extrusion ratio increased to 4:1~4.7:1, complete recrystallization is achieved, PPB can also be completely eliminated. At an extrusion temperature of 1130 ℃ and an extrusion ratio of 4.7:1, in the range of 20-50 mm/s extrusion speed, the grains tend to grow much larger. At an extrusion temperature of 1110 ℃, an extrusion speed of 35 mm/s, and an extrusion ratio of 4.7:1, the microstructure of the entire extruded bar is rather uniform. From the head of the bar to the tail, the grains are slightly refined. The grains at the edge of the extruded bar are smaller than that at the core and 1/2R.