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Using a sample of 96,201 primary red clump (RC) stars selected from theLAMOST and Gaia surveys, we investigate the stellar structure of the Galacticdisk. The sample stars show two separated sequences of high-[{\alpha}/Fe] andlow-[{\alpha}/Fe] in the [{\alpha}/Fe]-[Fe/H] plane. We divide the sample starsinto five mono-abundance populations (MAPs) with different ranges of[{\alpha}/Fe] and [Fe/H], named as the high-[{\alpha}/Fe], high-[{\alpha}/Fe] &high-[Fe/H], low-[Fe/H], solar, high-[Fe/H] MAPs respectively. We present thestellar number density distributions in the R R Z plane, and the scale heightsand scale lengths of the individual MAPs by fitting their vertical and radialdensity profiles. The vertical profiles, the variation trend of scale heightwith the Galactocentric radius, indicate that there is a clear disk flare inthe outer disk both for the low-[{\alpha}/Fe] and the high-[{\alpha}/Fe] MAPs.While the radial surface density profiles show a peak radius of 7 kpc and 8 kpcfor the high-[{\alpha}/Fe] and low-[{\alpha}/Fe] MAPs, respectively. We alsoinvestigate the correlation between the mean rotation velocity and metallicityof the individual MAPs, and find that the mean rotation velocities are wellseparated and show different trends between the high-[{\alpha}/Fe] and thelow-[{\alpha}/Fe] MAPs. At last, we discuss the character of thehigh-[{\alpha}/Fe] & high-[Fe/H] MAP and find that it is more similar to thehigh-[{\alpha}/Fe] MAP either in the radial and vertical density profiles or inthe rotation velocity.

Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample VII: the Stellar Disk Structure Revealed by the Mono-abundance Populations