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$\require{mediawiki-texvc}$A stellar chromospheric activity database ofsolar-like stars is constructed based on the Large Sky Area Multi-Object FiberSpectroscopic Telescope (LAMOST) Low-Resolution Spectroscopic Survey (LRS). Thedatabase contains spectral bandpass fluxes and indexes of Ca II H&K linesderived from 1,330,654 high-quality LRS spectra of solar-like stars. We measurethe mean fluxes at line cores of the Ca II H&K lines using a 1 ${\AA}$rectangular bandpass as well as a 1.09 ${\AA}$ full width at half maximum(FWHM) triangular bandpass, and the mean fluxes of two 20 ${\AA}$pseudo-continuum bands on the two sides of the lines. Three activity indexes,$S_{\rm rec}$ based on the 1 ${\AA}$ rectangular bandpass, and $S_{\rm tri}$and $S_L$ based on the 1.09 ${\AA}$ FWHM triangular bandpass, are evaluatedfrom the measured fluxes to quantitatively indicate the chromospheric activitylevel. The uncertainties of all the obtained parameters are estimated. We alsoproduce spectrum diagrams of Ca II H&K lines for all the spectra in thedatabase. The entity of the database is composed of a catalog of spectralsample and activity parameters, and a library of spectrum diagrams. Statisticsreveal that the solar-like stars with high level of chromospheric activity($S_{\rm rec}>0.6$) tend to appear in the parameter range of $T_{\rm eff}\text{(effective temperature)}<5500\,{\rm K}$, $4.3<\log\,g\text{ (surfacegravity)}<4.6$, and $-0.2<[{\rm Fe/H}]\text{ (metallicity)}<0.3$. This databasewith more than one million high-quality LAMOST LRS spectra of Ca II H&K linesand basal chromospheric activity parameters can be further used forinvestigating activity characteristics of solar-like stars and solar-stellarconnection.

Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey