In view of problem that scheme of single preventing override trip and scheme of preventing override trip of surface power system cannot solve underground override trip fault effectively, the paper proposed a scheme that grip using power monitoring system to solve underground override trip fault.Taking power network of Henan Pingbao Coal Industry Company as example, it introduced realizing principle and implementing situation in details.The actual application showed that the scheme can realize cooperation of upper and lower Milk Additive switches and prevent override trip fault effectively.