The invention, which belongs to the wireless communication technology field, discloses a method for improving a covering range of a field intensity of a wireless communication network. According to the method, an internal diameter function and an external diameter function of an electromagnetic shade are constructed according to a shape of an obstacle; when first order derivatives of the internal diameter function and the external diameter function are discontinuous, the internal diameter function and the external diameter function are fitted into a first and a second substitution functions by utilizing a fourier least-square-fitting method, wherein first order derivatives of the first and the second substitution functions are continuous; and a dielectric constant of the electromagnetic shade is calculated by utilizing the internal diameter function and the first substitution function as well as the external diameter function and the second substitution function; the electromagnetic shade is manufactured according to the internal diameter function, the external diameter function and the dielectric constant of the electromagnetic shade so as to cover the obstacle. According to the invention, a covering range of a wireless field intensity is effectively improved and shadow fading is eliminated.