First lithium coating associated with ion cyclotron range of frequency (ICRF) plasmawas performed successfully in EAST.Results in reduction of both residual impurity and deuteriumin the vacuum vessel were obtained.Particularly the partial pressure of deuterium after the lithiumcoating was reduced by about a factor of 5.Impurity radiation in the plasma was reduced andelectron temperature increased by about 50%.Moreover,reproducible plasma discharges with highparameters,such as higher plasma current and density,could be easily obtained.These resultsshowed that plasma performance was improved.Even though only 2 g of lithium were injected,the effective lifetime of the Li film was raised up to 40 shots.
