The mechanism and performances of Voigt anomalous dispersion atomic optical filter (VADOF) are studied. The experimental results agree well with the theoretical calculation. When the magnetic field is 0.02 T and the cell temperature is 110 ℃, this kind of filter exhibited a FWHM of 0.8 GHz which is 0.5 GHz smaller than that of Faraday anomalous dispersion optical filter (FADOF), and the VADOF is easy to be integrated than FADOF. VADOF has a potential application in the field of optical communication inter-satellite.