Abstract: The charmless B_c→VV decays within the framework of QCD factorization were studied. In the evaluation, two different schemes for regulating the end-point divergence were adopted. The schemeⅠwas to use parameterization model, while the scheme Ⅱ was based on the infrared finite gluon propagator of Cornwall prescription. It is found that the end-point divergence appears only in the power-suppressed corrections in the annihilation amplitudes. Numerically, in the decay modes considered in this paper, the B_c→ρ^-ω, K^*-K^*0 decays have the relatively large branching fractions,on the order of 10^-7, and hence are hopeful to be firstly observed by the future experiments.