Heavy flavor spectroscopy studies at CMS

The CMS Collaboration has performed many studies in the field of heavy flavor spectroscopy. In this report, recent studies on exotic resonances in proton-proton collisions at $\sqrt{s} = 13$ TeV at CMS are presented. For the exotic hadrons, these results include the first evidence for X(3872) in heavy-ion collisions and three new structures in $J/\psi J/\psi$ mass spectrum. Beside the exotic hadrons, we also found new decay channels in conventional beauty hadrons, including $B^{0}_{s}\rightarrow\psi(2S)K^{0}_{S}$, $\Lambda_{b}^{0}\rightarrow J/\psi\Xi^{-}K^{+} $, $B^{0} \rightarrow \psi(2S)K^{0}_{S}\pi^{+} \pi^{-}$, and $\Xi_{b}^{-} \rightarrow \psi(2S)\Xi^{-}$.