Topological materials have regarded as a promise matter for applications in fields of spin electronic devices and quantum information processing.Since the topological states consist of antilocalized Dirac fermions where the spin and momentum are locked,to our best knowledge,it is still fully unknown how the topological states influence the quantum transports of magnetic impurities in comparison with those orthodox metallic electronic states of noble metal surfaces.Especially,one interesting question addressed is whether the conventional Kondo effect can be observed and exactly protect the TSS from magnetic scattering when magnetic adsorbates couple to the TSS.Recently,a few theoretical calculations have predicted that a Kondo effect would take place as long as the Fermi level do not locate exactly at the Dirac point,leading to spin-polarized electronic clouds that screened the magnetic moments of local impurities and thus suppressed the backscattering of the TSS.However,on relevant experiments were reported up to now.Here we attempt to investigate the adsorption behavior of CoPc molecules and Co atoms on semimetalic Sb(111)as well as the Kondo effects relating to the topological states and these magnetic impurities.Via low temperature scanning tunneling microscopy(STM),the adsorption configurations of CoPc and Co impurities are well clarified.The CoPc molecules tend to adsorb on bridge sites of the substrate and assemble into two types of well-ordered strcutures.But deposited Co atoms randomly distribute on Sb(111)and parts of them exhibiting a weak protrusion in STM images can dip into the surface layer.In scanning tunneling spectroscopy,a sharp peak near the Fermi energy is interpreted as a fingerprint of the Kondo resonance with a Kondo temperature of 205 23K.Density functional theory calculations reveal that the protruding Co atoms are responsible for the Kondo peak and those dipped Co atoms appear as nonmagnetic impurities.By identifying the quasiparticle interference wavevectors,only the scattering channels relating to backscattering confinements are observed for both surfaces with and without the Co adsorption.It suggests that the Kondo effect fully screens those protruding magnetic impurities and thereby suppresses the backscattering of the topological surface states.