Introduction  The ratio has become one of the main indicators for controlling the building capacity in power plant construction， but its calculation principle， calculation method and prescribed control indicators are partially missing and unreasonable. Therfore， it is necessary to summarize the existing problems， analyze the calculation criteria and control indicators， and propose its improved ideas and methods.

  Method  By comparing the current national and local relevant laws and regulations， different industry norms and standards in the manufacturing industry， combined with the current customary practices of the power plant， also by comparing the actual project volume ratio construction data， comprehensive solutions were proposed from various aspects such as technology and policy.

  Result  Provinces and cities may formulate and improve the power plant volume ratio index， in order to provide a clearer indicators for implementation. Super high-rise buildings are calculated multiple times in the ratio， which can reflect the building type and scale of power plant buildings more realistically. The ratio of different types power plant are considered to be subdivided， which is conducive to docking with current industry practices and conducive to refined design.

  Conclusion  Comprehensive suggestions are made from the aspects of policy index setting， industry customary practice docking， and technical solution selection， which are of practical significance for solving the volume ratio problems commonly encountered in power plant construction today， and can provide guidance for practical applications.