Abstract: Using ethanol hydration modified calcium oxide as the adsorbent, the influence of different modification parameters on the dechlorination effect was studied in a fixed bed experimental device, and analyses were conducted on the kinetics of HCl adsorption experimental results. Afrter which, the nonlinear fitting was carried out for the experimental data by five apparent kinetic models. Researches results show that, the order of fitting effect is Bangham model, quasi-second-order model, Elovich model, quasi-first-order model and particle internal diffusion model. The process of mass transfer and diffusion always has a significant influence on HCl adsorption, which is the key control step. In the initial stage of reaction, when the surface-active site is not occupied and the internal pore is not blocked, the external mass transfer process is the dominant control step. In the middle stage of reaction, because the original developed pore structure is blocked by the product layer, the diffusion resistance in the particles become the dominant factor in HCl adsorption process. Meanwhile, the chemical reaction in surface always plays a leading role in HCl adsorption process.