Government regulation has put forward strict requirements on the accounting of transmission and distribution prices. To achieve the dual carbon goal, it is necessary to increase the proportion of investment in supporting projects for distributed energy generation. Through differentiated analysis of the main parameters affecting power grid investment, including the effectiveness of investment scale, investment structure and investment timing, a differential grid investment and transmission and distribution price linkage model is constructed based on the SD platform, and four different models are set based on the influencing parameters. The calculation example results show that government regulation will lead to the calculation result of transmission and distribution price is significantly smaller than the conventional result, and the adjustment of investment scale, investment structure and investment timing will affect the transmission and distribution price to a certain extent, that the greatest impact is investment scale, and the least impact is investment timing has .