A　protocol　for　member　expansion　in　quantum　(t,n)　threshold　secret　sharing　schemes　was　proposed.　Without　a　trusted　center　and　modifying　the　shares　of　old　participants,　the　protocol　needs　that　t　(t　is　the　threshold)　old　participants　cooperate　to　generate　the　new　share.　Compared　with　the　previous　secret　sharing　protocols,　the　proposed　protocol　has　the　advantage　of　joining　new　participants　agilely.　(C)　2011　Elsevier　B.V.　All　rights　reserved.