Abstract: In order to solve the problem of low adsorption efficiency of natural zeolite for Se(Ⅳ) in wastewater, ferric chloride was used to modify the natural zeolite, and iron oxide was loaded on the modified zeolite surfacefor Se(Ⅳ) removal, which is named iron oxide modified zeolite. The structural and the adsorption characteristics of Se(Ⅳ) were compared between natural zeolite and iron oxide modified zeolite. The zeolite and iron oxide modified zeolite were characterized by X-ray fluorescence spectroscopy (XRF), X-ray diffraction pattern (XRD), scanning electron microscope (SEM) and nitrogen adsorption pore size distribution test (BET). Next, perform adsorption experiments, the influence of contact time, pH, adsorbent dosage, initial solution reaction concentration were considered, and the adsorption mechanism was described by adsorption kinetics and adsorption isotherms. The results show that: (1) The surface of the iron oxide modified zeolite formed finely divided spherical particles, which are distributed on the surface of the zeolite. (2) The adsorption efficiency of iron oxide modified zeolite for Se(Ⅳ) was high, especially at low pH. When pH was 3, Se(Ⅳ) adsorption was up to 97.7%. The theoretical maximum adsorption capacity was 46.901 mg/g. (3) The adsorption kinetic results of Se(Ⅳ) on iron oxide zeolite was consistent with the quasi-secondary kinetics, and the equilibrium adsorption could be described by Langmuir isotherm equation. (4) The soil added with Se(Ⅳ) modified zeolite all reached the standard of selenium-rich soil (>0.4 mg/kg). The results show that the adsorption capacity of iron oxide modified zeolite is higher than natural zeolite, and the modified zeolite loaded with Se(Ⅳ) can be used for soil improvement.