When the transmission line cannot fully switch off due to the fault of the trip, it usually forcedly recloses the trips of the crucial line to detect whether it is a temporary fault or not. However, the adopted measure with some blindness is not a favorable one. Thus, this paper proposes a new measure to use the actual information of thunder and lightning as the lightening alarming to decide whether to adopt the forced line measures or not. In the lightning alarming area, if the transmission line cannot reclose due to fault, it can carry out the forced line operation; otherwise, the forced line operation can not be adopted in order to avoid another fault impact on the operation system. This paper provides the process of the line lightning alarming, and the methods and examples of calculations on the forced power decision in order to examine the validity of the forced power transmission taking thunder and lightning as information.