In　this　study,　the　authors　proposed　upper　tolerance　limits　for　the　gamma　mixture　distribution　based　on　generalized　fiducial　inference,　and　an　MCMC　simulation　is　performed　to　sample　from　the　generalized　fiducial　distributions.　The　simulation　results　and　a　real　hydrological　data　example　show　that　the　proposed　tolerance　limits　are　more　efficient.