DCS (distributed control system) plays a decisive role in the overall operation of a nuclear power plant. If DCS fails,it will seriously affect the normal production of nuclear power plant,causing great losses. So it is very important to take perfect lightning protection measures on DCS of the nuclear power plant. In this paper,according to the actual situation of DCS in a nuclear power plant,by controlling lightning point,securely booting lightning into the ground network,improving low-resistance ground network,eliminating ground loops,determining the safety space,surge protection of power and signal,a set of complete lightning protection design scheme was systematically put forward. Some specific lightning protection measures were highlighted,such as the DCS grounding,equipotential bonds and shields,and some specific considerations were put forward. All of these could offer reference in the practical application. DCS (distributed control system) plays a decisive role in the overall operation of a nuclear power plant. If DCS fails, it will seriously affect the normal production of nuclear power plant, causing great losses. So it is very important to take perfect lightning protection measures on DCS of the nuclear power plant. In this paper, according to the actual situation of DCS in a nuclear power plant, by controlling lightning point, securely booting lightning into the ground network, improving low-resistance ground network, eliminating ground loops, determining the safety space, surge protection of power and signal, a set of complete lightning protection design were was put forward. Some specific lightning protection measures were highlighted, such as the DCS grounding, equipotential bonds and shields, and some specific considerations were put forward. All of these could offer reference in the practical application.