Abstract: According to the features of low calorific value, high ash and high moisture contents and low additional value of the lignite, a high temperature steam acti vated experiment was applied to prepare the lignite base activated coke.An optimal activated technical condition obtained from the experiment was activated temperatur e of 850 °C, steam flow quantity of 1.0 kg/ (kg-h) and activated time of 2 h.Under this condition, an iodine adsorption value of the activated coke was over 500 mg/g, the ignition lost rate was 34% and under the same activated condition, the activated coke of the de-ash lignite would have a higher idine adsorption value than the activate d coke of the raw lignite .After the immersion in an copper nitrate solution with three different quantity fraction of 10%, 20% and 30% and calcinations for the activated C oke, the prepared SCR denitration catalyst would have a high denitration rate within 20 min and the denitration rate of the activated coke all could be over 80% and cou Id meet the industrial requirements.