Abstract: Well flushing is not noly a key process,but also the most time-consuming work in production period.On the basis of researching the geological and hydrogeological conditions,this paper mainly introduces ammonium hydrogen fluoride well flushing process used in Semizbay uranium deposit.when both ammonium hydrogen fluoride and sulfuric acid are injected into production wells,hydrofluoric acid is generated.It can disslove silicon dioxide and improve specific premeabilty of ore bed.A series of field tests were carried on in order to study the feasibility afterwards.Good results and test parameters were obtained.The results indicated that the flowrate of production wells had been greatly increased after well flushing.