White dwarfs identified in LAMOST Data Release 5

In this paper, we report white dwarfs identified in the 5th Data Release of Large Area Multi-Object fibre Spectroscopic Telescope, including spectral types DA, DB, DC, DZ, and so on. There are 2 625 DA spectra 281 stars, 182 DB 166 62 DC 58 36 DZ 33 stars many other identified, addition to our previous paper (Data 2). Among those sources, 393 46 new identifications after cross-matching with literature. order select candidates, use classification result from LAMOST pipeline, colour-colour cut method a random forest machine learning method. For DBs, since there is no template for pipeline model, chosen candidates. All WD candidates have been visually checked individually. The parameters effective temperature, surface gravity, mass, cooling age estimated relatively high signal-to-noise ratio DAs DBs. peaks mass distributions found be around 0.62Msun 0.65Msun, respectively. Finally, data used dwarf second phase survey also addressed paper.