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In this work, we identify 734 ultracool dwarfs with a spectral type of M6 orlater, including one L0. Of this sample, 625 were studied spectroscopically forthe first time. All of these ultracool dwarfs are within 360~pc, with a\textit{Gaia} G magnitude brighter than ~19.2 mag. By studying the spectra andchecking their stellar parameters (Teff, logg, and [FeH] derived with theLAMOST pipeline, we found their cool red nature and their metallicity to beconsistent with the nature of Galactic thin-disk objects. Furthermore, 77 ofthem show lithium absorption lines at 6708A, further indicating their youngages and substellar nature. Kinematics obtained through LAMOST radialvelocities, along with the proper motion and parallax data from Gaia EDR3, alsosuggest that the majority of our targets are thin-disk objects. Kinematic ageswere estimated through the relationship between the velocity dispersion and theaverage age for a certain population. Moreover, we identified 35 binaries, with6 of them reported as binaries for the first time.

Ultracool dwarfs identified using spectra in LAMOST DR7