Mercury is one of the harmful trace heavy metal elements in coal with strong volatility and toxicity. During coal combustion,mercury is mainly released into the flue gas in the form of Hg0. The element Cl in flue gas can efficiently oxidize Hg0 to Hg2+,and then Hg2+ can be removed in downstream dust removal and wet desulfurization facilities. However,most of the coal in China belongs to low-chlorine coal,resulting in a high proportion of Hg0 in flue gas,and the low mercury removal efficiency of existing flue gas pollutant control units in power plants. In order to solve the problems of low chlorine content,poor oxidation effect and high content of Hg0 in flue,it was proposed to impregnate cordierite with four kinds of chlorine salts to prepare MClx/Cord adsorbent. The Hg0 oxidation experiment of the adsorbent with a wide temperature window was carried out to explore the oxidation performance of cordierite modified by chlorine salts to Hg0. The results show that in the range of 0-8% O2 content and 150-350 ℃,the highest Hg0 removal efficiency of cordierite is only 8%,while that of cordierite sorbents modified with CaCl2,MgCl2,FeCl3 and CuCl2 reach 30,95,97 and 98%,respectively. It can be seen that the chlorine salts greatly improve the performance of cordierite sorbents for removal of Hg0. The temperature and oxygen content have great influence on the Hg0 removal performance of MgCl2/Cord,CaCl2/Cord and FeCl3/Cord. The temperature and O2 content have little influence on the Hg0 removal efficiency of CuCl2/Cord,which is always more than 93%. CuCl2/Cord shows a stable performance on mercury oxidation removal,so it is suitable to be used as a potential oxidation sorbent for oxidation and adsorption removal of Hg0 from flue gas. Chlorine salt impregnation modification can improve the oxidation performance of cordierite to Hg0. Cordierite modified by CuCl2 impregnation has the best Hg0 oxidation effect,and it is almost not affected by the change of temperature and O2 content.