Introduction  High big-span irregular structures are increasingly used in the power industry, and their structural selection is of great significance to process adaptability, structure safety and economy.

  Method  Through±1 100 kV Changji DC Converter Station project, space tubular truss structure was introduced to be used in the indoor DC Hall structure design, which is a high big-span irregular electric structure. According to the electrical process layout and its loadings. This paper gave the process how to select the space tubular truss structural form, the structure characteristics and its technology advantages; the structure integral calculation and key component design calculation results were shown in the design; after comparing with the lattice grid structure form both in technical and economic aspect, prospects of using space tubular truss structure in high big-span irregular electric structures and its key matters in design was discussed.

  Result  Analysis shows that the space tubular truss structure is a space self-stabilizing system with good structural safety, strong process adaptability, convenient processing and installation, simple and beautiful.

  Conclusion  The space tubular truss structure will be a preferred choice for the design of high big-span irregular electric structures in the future.