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The leptonic radiative decay $B \to \gamma l\nu$ is of great importance inthe determination of $B$ meson wave functions, and evaluating the form factors$ F_{V,A}$ are the essential problem on the study of this channel. We computednext-to-leading power corrections to the form factors within the framework ofPQCD approach, including the power suppressed hard kernel, the contributionfrom a complete set of three-particle $B$ meson wave functions up to twist-4and two-particle off light-cone wave functions, the $1/m_b$ corrections inheavy quark effective theory, and the contribution from hadronic structure ofphoton. In spite of large theoretical uncertainties, the overall powersuppressed contributions decreases about $50\%$ of the leading power result.The $\lambda_B$ dependence of the integrated branching ratio is reduced afterincluding the subleading power contributions, thus the power corrections leadto more ambiguity in the determination of $\lambda_B$ from $B \to \gamma l\nu$decay.

Subleading power corrections to $B\to \gamma l\nu $ decay in PQCD approach