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We simulated the $R$-band contribution of the host galaxy of TeV $\gamma$-rayBL Lac object Mrk 501 in different aperture sizes and seeing conditions . Theintensive observations were run with the 1.02 m optical telescope at YunnanObservatories from 2010 May 15 to 18. Based on the host subtraction datapresented in Nilsson et al. (2007), the subtraction of host galaxycontamination results in significant seeing-brightness correlations. Thesecorrelations would lead to illusive large amplitude variations at shorttimescales, which will mask the intrinsic micro variability, thus gives rise todifficulty in detecting the intrinsic micro variability. Both aperture size andseeing condition influence the flux measurements, but aperture size impact theresult more significantly. Based on the parameters of elliptical galaxyprovided in Nilsson et al. (1999), we simulated the host contributions of Mrk501 in the different aperture sizes and seeing conditions. Our simulation dataof the host galaxy obviously weaken these significant seeing-brightnesscorrelations for the host-subtracted brightness of Mrk 501, and can help usdiscover the intrinsic short timescale micro variability. The pure nuclear fluxis $\sim$ 8.0 $\rm{mJy}$ in \emph{R} band, i.e., AGN has a magnitude of$R\sim13^{m}_{\cdot}96$.

$R$-band host galaxy contamination of TeV $\gamma$-ray blazar Mrk 501: effects of the aperture size and seeing