The distorted electric field research of high buildings adjacent to high-voltage AC transmission lines is one of the foundations for assessing the electromagnetic environment of power transmission lines. The paper considers the characteristics of high-voltage AC power transmission lines and high buildings, and uses line element models and surface element models to simulate the charge distribution of power transmission lines and high buildings, respectively. In order to ensure that the formed potential coefficient matrix is symmetrical, the potential coefficient matrix is normalized to the element length and area, thereby, and it can simplify the solution of matrix elements and improve the accuracy of the calculation. The calculation results show that the influence of high buildings on the electric field distortion of high-voltage transmission lines presents different characteristics at different heights. Therefore, in the actual electromagnetic environment assessment, it should be analyzed separately according to specific calculation scenarios. The method proposed in this paper can be extended to the calculation and analysis of the electromagnetic environment of the whole community with a bunch of high buildings.