Introduction  For the purpose of unifying and standardising construction process of substation, the assembled building is popularized and its standard design principles are made by the State Grid Corporation of China. However, it may result in unnecessary waste if the designers always simply apply the standard design principles and atlas. Combining the development of construction materials and practical application, the refined design is necessary and essential.

  Method  On the premise of meeting the requirements of structure, function, energy conservation, noise reduction and fire prevention of the building, and basing on the performance of building materials, refined design of the assembled building wall of substation was presented and the concrete design parameters such as wall material and dimensions achieving energy conservation and material saving were clarified.

  Results  After several practical tests in the field, it shows that this technique is effective on saving construction materials, reducing size of construction site and energy conservation.

  Conclusion  The feasibility and practicability of this technique is demonstrated, which can provide reference and guidance for the engineers and managers in the similar projects.