Abstract: Distribution of V2O5 on activated coke (AC) can not be characterized by common techniques such as X-ray diffraction (XRD) analysis and EXAFS, etc. In this article, chemical absorption of SO2 on V2O5/ACs is used to elucidate V2O5 distribution. The aggregation of V2O5 is calculated through the amount of lattice oxygen in V2O5 responsible for SO2 adsorption and oxidation. Results show that, under the conditions used, the aggregation degree of V2O5 increases with V2O5 loading, but the number of aggregates change a little. Differences in AC′s surface area, ash, O, and N contents show little influence on V2O5 distribution.