Fix a, b ∈ C, let LW (a, b) be the loop W (a, b) Lie algebra over C with basisIn this paper, a formal distribution Lie algebra of LW (a, b) is constructed. Then the associated conformal algebra CLW (a, b) is studied, whereIn particular, we determine the conformal derivations and rank one conformal modules of this conformal algebra. Finally, we study the central extensions and extensions of conformal modules.