Abstract: The use of coal slime thermal drying system using coal as fuel generally gives rise to atmospheric pollution because of its emission of flue gas.Following an introduction to the structural design and working principle of such a kind of drying system,the technical schemes for flue gas desulfurization and denitration are proposed based on the result of a general survey of such technologies currently available both within and abroad.Practice shows that the contents of SOxand NOxin the gas emission can be effectively reduced by using the double alkali desulfurization and SNCR denitration methods.Field application of the technologies has met with good result,with the gas emissions well up to the environmental protection requirement.