  The LAMOST Medium-Resolution Spectroscopic Survey (LAMOST-MRS) provides an
unprecedented opportunity for detecting multi-line spectroscopic systems. Based
on the method of Cross-Correlation Function (CCF) and successive derivatives,
we search for spectroscopic binaries and triples and derive their radial
velocities (RVs) from the LAMOST-MRS spectra. A Monte-Carlo simulation is
adopted to estimate the RV uncertainties. After examining over 1.3 million
LAMOST DR7 MRS blue arm spectra, we obtain 3,133 spectroscopic binary (SB) and
132 spectroscopic triple (ST) candidates, which account for 1.2% of the
LAMOST-MRS stars. Over 95% of the candidates are newly discovered. It is found
that all of the ST candidates are on the main sequence, while around 10% of the
SB candidates may have one or two components on the red giant branch.
