[en] Siliconization and lithium coating of the wall in the HL-1M tokamak were performed by means of DC glow discharges with a mixture of SiH₄ and he and lithium evaporation in a He glow discharge, respectively. With the wall conditioning impurities and radiation power losses are generally lower than those with boronization, and strong wall pumping and low hydrogen recycling occur in these tokamak discharges. The excellent wall conditions lead to great progresses in the experiments such as the multi-shoot pellet injection, LHCD and long pulse discharges. Removal of these coatings by DC glow discharges with H₂ and He was demonstrated