The arc erosion behavior of Cu–0.23Be–0.84 Co alloy after heat treatment was investigated experimentally by a JF04 C electric contact test system. The arc duration, arc energy, contact resistance and contact pressure of Cu–0.23Be–0.84 Co alloy after solution treatment and aging treatment were analyzed. The arc erosion morphologies were contrastively observed by a three-dimensional measuring system and scanning electron microscopy. For the Cu–0.23Be–0.84 Co alloy in solution state and aging state, the maximum values of arc duration are 90 and 110 ms, and the arc energies are 15,000 and18,000 m J, respectively. The maximum value of the contact resistance of Cu–0.23Be–0.84 Co alloy in different states is about 33 m X. The contact pressure of Cu–0.23Be–0.84 Co alloy in solution state generally changes between 50 and 60 c N during whole make-and-break contacts, while in aging state, it has a larger fluctuation range. Moreover, the quality of moving contact(anode) decreases, while static contact(cathode) increases. The materials transfer from anode to cathode during make-and-break contacts. The total mass losses of Cu–0.23Be–0.84 Co alloy in solution state and aging state are 3and 1.2 mg, respectively. In addition, a number of discrete corrosion pits, molten droplet, porosity and cavity distribute on the surface of moving contact and static contact. The arc erosion model of Cu–0.23Be–0.84 Co alloy in make-and-break contact was built. The arc erosion resistance of Cu–0.23Be–0.84 Co alloy after heat treatment is closely related to the microstructure and the properties of contact materials. This experimental study is important to evaluate the anode or cathode electrocorrosion fatigue life. The arc erosion behavior of Cu-0.23Be-0.84 Co alloy after heat treatment was investigated experimentally by a JF04 C electric contact test system. The arc duration, arc energy, contact resistance and contact pressure of Cu-0.23Be-0.84 Co alloy after solution treatment and aging treatment were analyzed. The arc erosion morphologies were contrastively observed by a three-dimensional measuring system and scanning electron microscopy. For the Cu-0.23Be-0.84 Co alloy in solution state and aging state, the maximum values ​​of arc duration are 90 and 110 ms, and the arc energies are 15,000 and 18,000 mJ, respectively. The maximum value of the contact resistance of Cu-0.23Be-0.84 Co alloy in different states is about 33 m X. The contact pressure of Cu -0.23Be-0.84 Co alloy in solution generally generally changes between 50 and 60 cN during whole make-and-break contacts, while in aging state, it has a larger fluctuation range. Moreover, the quality of moving contact (anode) decreas The total mass losses of Cu-0.23Be-0.84 Co alloy in solution state and aging state are 3 and 1.2 mg, respectively, while static contact (cathode) increases. The materials transfer from anode to cathode during make-and-break contacts. . In addition, a number of discrete corrosion pits, molten droplet, porosity and cavity distribute on the surface of moving contact and static contact. The arc erosion model of Cu-0.23Be-0.84 Co alloy in make-and-break contact was built . The arc erosion resistance of Cu-0.23Be-0.84 Co alloy after heat treatment is closely related to the microstructure and the properties of contact materials. This experimental study is important to evaluate the anode or cathode electrocorrosion fatigue life.