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We present the second release of value-added catalogues of the LAMOSTSpectroscopic Survey of the Galactic Anticentre (LSS-GAC DR2). The cataloguespresent values of radial velocity $V_{\rm r}$, atmospheric parameters ---effective temperature $T_{\rm eff}$, surface gravity log$g$, metallicity[Fe/H], $\alpha$-element to iron (metal) abundance ratio [$\alpha$/Fe]([$\alpha$/M]), elemental abundances [C/H] and [N/H], and absolute magnitudes${\rm M}_V$ and ${\rm M}_{K_{\rm s}}$ deduced from 1.8 million spectra of 1.4million unique stars targeted by the LSS-GAC since September 2011 until June2014. The catalogues also give values of interstellar reddening, distance andorbital parameters determined with a variety of techniques, as well as propermotions and multi-band photometry from the far-UV to the mid-IR collected fromthe literature and various surveys. Accuracies of radial velocities reach5kms$^{-1}$ for late-type stars, and those of distance estimates range between10 -- 30 per cent, depending on the spectral signal-to-noise ratios. Precisionsof [Fe/H], [C/H] and [N/H] estimates reach 0.1dex, and those of [$\alpha$/Fe]and [$\alpha$/M] reach 0.05dex. The large number of stars, the contiguous skycoverage, the simple yet non-trivial target selection function and the robustestimates of stellar radial velocities and atmospheric parameters, distancesand elemental abundances, make the catalogues a valuable data set to study thestructure and evolution of the Galaxy, especially the solar-neighbourhood andthe outer disk.

LAMOST Spectroscopic Survey of the Galactic Anticentre (LSS-GAC): the second release of value-added catalogues