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We selected 4593 hot subdwarf candidates from the Gaia DR2Hertzsprung-Russell (HR) diagram. By combining the sample with LAMOST DR5, weidentified 294 hot subdwarf stars, including 169 sdB, 63 sdOB, 31 He-sdOB, 22sdO, 7 He-sdO and 2 He-sdB stars. The atmospheric parameters (e.g., T_{eff} ,log g, log(nHe/nH)) are obtained by fitting the hydrogen (H) and helium (He)line profiles with synthetic spectra. Two distinct He sequences of hot subdwarfstars are clearly presented in the T_{eff} - log g diagram. We found that theHe-rich sequence consists of the bulk of sdB and sdOB stars as well as all ofthe He-sdB, He-sdO and He-sdOB stars in our samples, while all the stars in theHe-weak sequence belong to the sdO spectral type, combined with a few sdB andsdOB stars. We demonstrated that the combination of Gaia DR2 and LAMOST DR5allows one to uncover a huge number of new hot subdwarf stars in our Galaxy.

New hot subdwarf stars identified in Gaia DR2 with LAMOST DR5 spectra