中国物理学会高能物理分会第十三届全国粒子物理学术会议（2021）

With 448 M psi(2S) events collected with the BESIII detector, many decay studies of charmonium states blow open-charm threshold have been performed. In this talk, some recent progresses will be presented. It will include an observation of the decays chi_cJ -> n Ks anti-Lambda + c.c., measurement of the inclusive branching fraction for psi(2S) -> Ks + anything, measurements of the branching fractions of psi(3686) -> anti-Sigma0 Lambda + c.c. and chi_cJ (J=0,1,2) -> Lambda anti-Lambda.