Abstract: We analysis a lightning accident example professionally in this paper, the electronic equipments in Ziyang Petroleum Administration Station had several times damaged by lightning strikes every year, although it had installed some SPDs (surge protective devices) .We can conclude:Lightning protection project is a systematic project, if any sector in lightning protection has been ignored or imperfect, perhaps, electronic equipments and facilities will be destroyed by lightning.From modern lightning theory, the important reasons of lightning-strike to this station include: insufficient of SPD's stage number for the PABX's power system;here is not any SPD installed for signal's system;there is not any shielding or equipotential connecting measures for computer room.