Reducing　sediment　is　important　for　the　utilization　and　production　of　green　tea　infusion　and　concentrate.　The　effect　of　tannase　on　sediment　formation　in　green　tea　infusion　and　concentrate　was　investigated.　The　results　showed　that　the　amount　of　sediment　of　green　tea　infusion　significantly　decreased　after　tannase　treatment,　which　was　due　to　the　decrease　in　the　concentration　of　gallated　catechins.　Significant　positive　correlations　between　the　sediment　amount　and　the　gallated　catechin　(r　=　0.980,　p　＜　0.01)　concentration　were　found.　The　formation　of　sediment　in　green　tea　infusion　was　significantly　influenced　by　the　tannase　concentration　and　hydrolysis　time.　0.5　mg/mL　tannase　concentration,　120　min　hydrolysis　time,　and　35　degrees　C　hydrolysis　temperature　were　found　to　be　the　optimized　hydrolysis　parameters　for　reducing　the　sediment.　Tannase　treatment　not　only　lowered　the　amount　of　sediment　of　green　tea　concentrate　(74.63%),　but　it　also　improved　the　taste　quality　of　green　tea　concentrate　after　storage.　These　results　could　be　used　to　improve　the　quality　and　utilization　of　green　tea　infusion　and　concentrate.