Introduction  Power transmission and transformation projects are energy projects constructed with key state investment. In order to clarify the economic benefits and expected effects of such projects, it is necessary to carry out an economic evaluation of the entire power transmission and transformation projects.

  Method  This paper took a 500 kV power transmission and transformation project in Guangdong as an example, established an index system for comprehensive evaluation of financial benefits firstly, and then used the fuzzy comprehensive evaluation method to make a comprehensive evaluation of the financial benefits of it.

  Result  Through empirical analysis, it shows that the fuzzy comprehensive evaluation method can effectively evaluate the economic benefits of the power transmission and transformation project. At the same time, the final comprehensive evaluation results of such projects in Guangdong are relatively successful, indicating that its level of financial benefit is good.

  Conclusion  Using the fuzzy comprehensive evaluation method to conduct economic evaluation of power transmission and transformation projects can effectively evaluate whether the projects can produce good economic benefits and whether the investment into the projects can produce good expected return.