In order to investigate the promotional effects of ruthenium (Ru) addition on the ihucture; activity, and SO2 resistance-of MnO TiO2 mixed,oxide adsorbent for Hg removal at lower temperature, the Ru modified MnOx,TiO2 (RMT) adsorbent,.MnOx-TiO2 (MT), and RuO2-TiO2 (RT) were synthesized by the sol gel method. The fresh and spent adsorbents were characterized by-N physisorption, XRD, FTIR, HrTPR, XPS, TG-DSC, and SO2-TPD. It was found that the addition of Ru oxide not only can increase the activity of Hg remoVal but also can significantly enhance 'their SO2 resistance performance. The amorphous structure and sortie synergistic effects among Ru, Mn and oxygen specie s. may play key roles in promoting Hg removal and superior 'performance of SO2 tolerance. Although RMT exhibited an excellent SO2 resistance performance for Hg capture, some active sites would be destroyed with aS high as 2500 ppm of SO2, introduced. The sulfate species deposited On. the surface of poisoned-adsorbent and the consumption of active MnO and Root by SO2, had a negative activity for Hg removal. The enhanced effect of Ru modified MnOx Ti02 adsorbent on SO2 resistance could be derived from the selective formation of sulfate species on Rt. The possible mechanism of Ru addition on the SO2 resistance of MnOx TiO2 mixed-oxide adsorbent has also been proposed.