The characteristics of conductivity anisotropy of earth medium due to EDA phenomena were demonstrated,tha pattern and characteristics of MT response function variations caused by the changes of conductivity anisotropy were analysed and studied, the distinguishability of MTS to the earthquake precursor of EDA electrical changes and the necessity of considering the anisotropy in the interpretation of MT data were explained, and the.inverse problem of MT data for the symmetrically anisotropic layered medium was discussed.