Abstract: Radiation field variation law is studied by using the self-made radiation field test platform, and the influence of the type, diameter and number of layers of glass beads is discussed. The results indicated that the diameter of glass beads had almost no effect on the radiation flux; the type of glass beads had a greater impact on the radiation flux that the untreated glass beads had the largest radiation flux, the pretreatment followed, and the loaded titanium dioxide glass beads had the smallest radiation flux; The number of layers of glass beads has the greatest influence on the radiation flux. The number of glass beads filled should not be more than two layers for the fixed bed photocatalytic reactor with glass beads.