Aiming at the problem that description of physical link information in SCD file is incomplete, description of physical link information in SPCD file is non-intuitive, correlation between SCD and SPCD is little, and due to the lack of mapping information between virtual and real loops in substation operation and maintenance, link fault detection is difficult, this paper proposes a virtual-real link mapping scheme based on SPCD, includes using SPCD to code physical link, extending physical link model to SCD, supplying the electrical (optical) link model to SCD, and constructing the mapping between virtual link and real link. It provides data support for advanced applications such as full-site physical loop visualization, virtual-real link mapping visualization and fast fault diagnosis, provides a feasible scheme for switch configuration-free, at the same time, ensures the consistency of link information between SCD and SPCD.