The discharge damage behavior of drive motor bearings in DHT systems is a key cause of abnormal vibration and noise in new energy vehicles. This issue stems from the shaft voltage generated during motor operation and is closely related to the bearing's operating state. This study focuses on the DHT system of a new energy vehicle, analyzing the relationship between voltage characteristics and surface damage behavior in motor bearings under different conditions. The results show that at low speeds, the bearing voltage amplitude is low, and no abnormal surface damage occurs. At high speeds, the drive motor (P3) bearings exhibit discharge damage in the form of voltage grooves, while the generator motor (P1) bearings show no damage. This is attributed to the significantly higher voltage amplitude in P3 motor bearings compared to P1. Additionally, due to high voltage characteristics, the discharge damage in the front bearings of the P3 motor is more severe than in the rear bearings, confirming that high voltage amplitude is the key factor causing discharge damage.