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This study expands the coverage and improves the homogeneity of thedistribution of MILES template stars in the parameter space, as well as extendsthe wavelength coverage of the template spectra to the far red beyond theCa\,{\sc{ii}} triplet. To achieve this we have carried out a majorobservational campaign using the OMR long-slit spectrograph mounted on the NAOC2.16\,m telescope and the YFOSC long-slit spectrograph mounted on the YNAO2.4\,m telescope. The original sample is based on the MILES library,supplemented by 918 stars selected from PASTEL database. In total, 822 OMR and1,324 YFOSC spectra, covering respectively the wavelength ranges$\lambda\lambda$3800--5180 and $\lambda\lambda$5150--9000, have been collectedand reduced. The spectra have a mean resolution FWHM (full-width athalf-maximum) of $\sim 3.3$\,{\AA} and are wavelength- and flux-calibrated toan accuracy of $\sim 20$\,km\,s$^{-1}$ and $\sim 5$\,per\,cent, respectively.The spectra are further corrected for systematic errors in the wavelengthcalibration to an accuracy of $\sim 4$\,km\,s$^{-1}$ by cross-correlating withthe theoretical spectra. Almost all the spectra have an average signal to noiseratio (SNR) better than 100 per pixel. Combined with the MILES spectra, thereare now 1,731, 1,542, 1,324 and 1,273 stars with spectra covering respectively$\lambda\lambda$3800--5180, $\lambda\lambda$3800--7500,$\lambda\lambda$5150--9000 and $\lambda\lambda$3800--9000. This paper describesour template star selection, the observation and data reduction, and presentsthe reduced spectra collected hitherto.

LEMONY--a Library of Empirical Medium-resolution spectra by Observations with the NAOC Xinglong 2.16\,m and YNAO Gaomeigu 2.4\,m telescopes