Abstract: The special investment in power grid production technical transformation is an important part of the investment management of power grid fixed assets, which is of great significance to improve the technical level of power grid equipment, save energy and reduce consumption, and improve the reliability and stability of power supply. The implementation of technical transformation projects can effectively improve the equipment performance and optimize the operation of the power grid, which is an inevitable requirement for the sustainable development of the power grid. This article calculates the input and output of the reactive power compensation device optimization project, and constructs a model for calculating the investment benefits of the reactive power compensation device optimization project from three aspects: loss reduction benefits, carbon emission reduction benefits, and asset pricing benefits. Through input-output analysis, the investment efficiency and economic effects of the project are studied, providing reference for the management and investment of reactive power compensation optimization technology transformation projects.