  We present a new method for the detection of double-lined spectroscopic
binaries (SB2) using $v\sin{i}$ values from spectral fits. The method is tested
on synthetic and real spectra from LAMOST-MRS. It can reliably detect SB2
candidates for double-lined binaries with
$v\sin{i}_1+v\sin{i}_2<300\,km\,s^{-1}$ if the radial velocity separation is
large enough. Using this method, we detect 2460 SB2 candidates, 1410 of which
are new discoveries. We confirm the correlation between the radial velocity
separation estimated by the binary model and $v\sin{i}_0$ estimated by the
single star model using the selected sample. Additionally, our method finds one
new SB2 candidate in open cluster M~11.
