Causes and solutions of overload after automatic bus transfer action are analyzed. From the perspective of power system reliability, the advantages and disadvantages of these overload solutions are compared, their working conditions and announcement are obtained, and the implementation schemes are improved. Finally, smart overload cutting when automatic bus transfer action is presented as a new solution, which applies to automatic bus transfer devices in smart substation. This new solution can improve reliability of automatic bus transfer, avoid overload and cut load exactly. At the same time, a method is proposed for smart overload cutting solution to get export matrix online.