  Runaway stars are OB-type stars ejected from their birthplace with large
peculiar velocities. The leading hypothesis addressed in their formation
includes the supernova ejection mechanism and the dynamic ejection scenario.
Identification of runaway populations is the first step to investigating their
formation and evolution. Here we present our work of searching for Galactic
runaway candidate stars from the LAMOST Medium-Resolution Survey DR8 database.
After studying the kinematic properties for a collection of 4,432 early-type
stars, predominantly B-type stars, using the radial velocity measurements from
LAMOST DR8 and astrometric solutions made by Gaia DR3, we identified 229
runaway candidate stars. They span a wide distribution in projected rotational
velocities. We investigated the Galactic spatial distribution of the runaway
population and noticed that most of them likely reside within the Galactic thin
disk. Based upon analyzing the Doppler shifts of the candidate stars, we found
two binary runaway candidates displaying velocity variation with estimated
orbital periods of 40 and 61 days.
