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The application discloses a network data interface modeling method for a nuclear power plant DCS system gateway station, and relates to the technical field of safety level DCS of nuclear power plants; in the DCS system of the nuclear power plant, transmission network variables are generated according to the service related data between a safety transmission station and a safety card; a Modbus protocol mapping address rule of the transmission network variables in each channel of the safety card is formulated; the mapping addresses of the transmission network variables in each channel are dynamically configured, and meanwhile, a mapping address list of the transmission network variables is automatically generated according to the sequence of the transmission network variables, so that the network variable generation of the interface transmission station and the gateway station is safely and effectively completed, the Modbus mapping address configuration of the gateway safety card is dynamically realized, and the mapping address list is quickly generated; while realizing the communication between the interface transmission station and the gateway station and between the gateway station and an external system, the physical memory is maximally utilized, and great convenience is brought to the online debugging of users.