Due to the location of the ground surrounding the installation of the electric field instrument more or less there are some buildings, but buildings have a certain atmospheric electric field distortion effect, resulting in inaccurate measurement values ??of the electric field. In this paper, Shenzhen, Ping and base atmospheric electric field instrument measured field strength data, using the finite difference, empirical mode decomposition (EMD) and other methods, the Shenzhen area ground atmospheric electric field instrument installation location environment of the site revised and studied Shenzhen atmosphere variation of the electric field. Studies have shown that (1) the potential away from the building location atmospheric electric field is horizontal equipotential line distribution, while at a location near the building of the atmospheric electric field formed a certain distortion, so the floor to base geodetic field measured value is inaccurate, atmospheric electric field distortion factor calculated atmospheric electric field instrument to the top is 0.364 1; (2) the use of empirical mode decomposition (EMD) method, the diurnal variation of atmospheric electric field strength signal decomposition concluded that the atmospheric electric field strength can be decomposed into 9 IMF component and a trend item, indicating that the Shenzhen area ground atmospheric electric field intensity oscillation cycle having a plurality of time scale changes. According to the trendterm component it can be seen that the magnitude of the overall strength of the electric field day showing a gradual increase trends.