Abstract: This paper takes the electric power discipline of railway post-station engineering as the research object, and carries out research on the construction of the standard system for digital design and delivery. On the basis of integrating theories including BIM (Building Information Modeling) information modeling, data-driven design and standard digitization, this paper proposes the overall architecture of the digital system for post-station engineering, and elaborates the key technical links of system construction from two dimensions of design standards and delivery standards. Combined with engineering practice, the effect of the system on efficiency improvement is verified. Meanwhile, shortcomings such as insufficient machine readability of standards and inconsistent cross-disciplinary interfaces are identified, and corresponding optimization directions are put forward, which can provide reference for the construction of digital systems in other disciplines.