We systematically study the semileptonic decays of ... in the light-front constituent quark model, where Bc represents the antitriplet charmed baryons of ... corresponds to the octet ones. We determine the spin-flavor structures of the constituents in the baryons with the Fermi statistics and calculate the decay branching ratios (Bs) and averaged asymmetry parameters (αs) with the helicity formalism. In particular, we find that ... Our results agree with the current experimental data. Our prediction for ... is consistent with those in the literature, which can be measured by the charm facilities, such as BESIII and BELLE. Some of our results for the ... semileptonic channels can be tested by the experiments at BELLE as well as the ongoing ones at LHCb and BELLEII.(ProQuest: ... denotes formulae omitted.)