Abstract: Vanadium redox flow battery energy storage system is considered to be one of the most promising energy storage systems because of its long life, high safety, independent battery power and energy storage capacity. The whole vanadium redox flow battery stack is mainly composed of several single batteries in series. The electrolyte required by the whole vanadium redox flow battery is distributed in parallel to each single battery through the electrolyte main pipe. The electrolyte pipes between the batteries are connected, forming a closed loop, and there will be shunt current, resulting in charge loss, efficiency and capacity utilization reduction. This paper introduces the generation principle of shunt current and the present research status of shunt current. Then, the model of the six-battery stack system is built to calculate the shunt current distribution.