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In this letter, we checked spectral properties of the well-known narrow lineSeyfert I Mrk142, in order to try to find effects of narrow line variability onBLR radius of Mrk142 which is an outlier in the R-L plane. Although, noimprovement can be found on BLR radius, apparent narrow line variability can beconfirmed in Mrk142. Using the public spectra collected from the Lick AGNMonitoring Project, the spectral scaling method based on assumption of constant\oiii line is firstly checked by examining broad and narrow emission lineproperties. We find that with the application of the spectral scaling method,there is a strong correlation between the \oiii line flux and the \oiii linewidth, but weaker correlations between the broad H$\alpha$ flux and the broadH$\beta$ flux, and between the broad H$\alpha$ flux and the continuum emissionat 5100\AA. The results indicate that the assumption of constant \oiii line isnot preferred, and caution should be exercised when applying the spectralscaling calibration method. And then, we can find a strong correlation betweenthe \oiii line flux and the continuum emission at 5100\AA, which indicatesapparent short-term variability of the \oiii line in Mrk142 over about twomonths.

Apparent \oiii variability in the narrow line Seyfert I Mrk142