Using the electromagnetic field stimulated by the horizontal electric dipole, this paper proposes the method of CSAMT near-field correction. According to the experiments, the result of this method is equivalent to that of the Cagniard resistivity in the distant area; nevertheless, the utilization of this method can obviously improve the distortion of the Cagniard resistivity in the near and transitional area. Therefore, this method will increase the depth of CSAMT exploration, extend the application field and reflect the changes of the vertical subsurface electric vividly.