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In this work, we study the radiative leptonic decays of $B^-$ and $D^-$mesons using factorization approach. Factorization is proved to be validexplicitly at 1-loop level at any order of $O(\Lambda_{\rmQCD}\left/m_Q\right.)$. We consider the contribution in the soft photon regionthat $E_{\gamma} \sim \left. \Lambda^2_{\rm QCD} /\right. m_Q$. The numericalresults shows that, the soft photon region is very important for both the $B$and $D$ mesons. The branching ratios of $B\to \gamma e\nu_e$ is $5.21\times10^{-6}$, which is about $3$ times of the result obtained by only consideringthe hard photon region $E_{\gamma}\sim m_Q$. And for the case of $D\to \gammae\nu_e$, the result of the branching ratio is $1.92\times 10^{-5}$.

Factorization of Radiative Leptonic Decays of $B^-$ and $D^-$ Mesons Including the Soft Photon Region