In this paper we calculate the technicolor correction to the production of a charged top pion in association with a W boson via bbar{b} annihilation at the CERN Large Hadron Collider in the context of the topcolor assisted technicolor model. We find that the cross section of pp rightarrow bbar{b} -> W^{pm}pi_t^{mp} at the tree level can reach a few hundred femtobarns for reasonable ranges of the parameters, roughly corresponding to the result of the process pp -> bbar{b} -> W^{pm}H^{mp} in the minimal supersymmetric standard model; the relative corrections arising from the one-loop diagrams are about a few percent to two dozen percent, and they will increase the cross section at the tree level. As a comparison, we also discuss the size of the hadron cross section via the other subprocess gg -> W^{pm}pi_t^{mp}.
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