The top-pions(π 0,± t ) predicted by extra dimensional descriptions of the topcolor scenario have similar feature with those in four dimensional topcolor scenario, which have large Yukawa couplings to the third generation quarks. In the context of the higgsless-top-Higgs(HTH) model, we discuss the production of these new particles at the CERN Large Hadron Collider(LHC) via various suitable mechanisms (gluongluon fusion, bottom-bottom fusion, gluon-bottom fusion, and the usual Drell-Yan processes) and estimate their production rates. We find that, as long as the toppions are not too heavy, they can be abundantly produced at the LHC. The possible signatures of these new particles might be detected at the LHC experiments. *

Due to the presence of extra top quark T in the little Higgs models, the CKM matrix is not unitary and the flavor changing neutral currents may exist at the tree level. In the context of the Littlest Higgs(LH) model, we discuss the topcharm production at the high-energy linear e + e − collider (LC) via the processes e + e − → tc + tc, e + e − → (tc + tc)ν e ν e , and e − γ → e − tc. We find that the resonance production cross section for the process e + e − → tc + tc is significantly larger, which can be detected in future LC experiments.