2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149557In this paper,we give the explicit formulae of vertex operators of ${U_q}(\widehat{B}_l)$ for level-one as operators on the Fock space. Meanwhile, we point out that the free field realization (by one fermionic field and $l$ bosonic fields) of highest weight module with highest weight $Λ_l$ has two irreducible modules.16 pages, Latex,some mistakes correctedQuantum Algebratext