As an ultra-narrow bandwidth optical filter with unique character of high efficiency, Faraday anomalous dispersion optical filter (FADOF) has been focused on by both international and domestic researchers in recent years. In this thesis the theoretical and experimental studies on Cs 852 nm FADOF were done on the base of reviewing the domestic and international development. A qualitative analysis on the magnetic field and temperature of the two main factors was given and the best working conditions were obtained. Hereby experiment was planned and at last a small-scale device was made.