  The deviation of the measurement of $R_{D}$ ($R_{D^{*}}$) from the Standard
Model (SM) expectation is $2.3\sigma$ ($3.1\sigma$). $R_{D}$ ($R_{D^{*}}$) is
the ratio of the branching fraction of $\overline{B} \rightarrow
D\tau\overline{\nu}_{\tau}$ ($\overline{B} \rightarrow
D^{*}\tau\overline{\nu}_{\tau}$) to that of $\overline{B} \rightarrow
Dl\overline{\nu}_{l}$ ($\overline{B} \rightarrow D^{*}l\overline{\nu}_{l}$),
where $l = e$ or $\mu$. This anomaly may imply the existence of new physics
(NP). In this paper, we restudy this problem in the supersymmetric extension of
the Standard Model with local gauged baryon and lepton numbers (BLMSSM), and
give one-loop corrections to $R_{D}$ ($R_{D^{*}}$).
