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Interstellar extinction in ultraviolet is the most severe in comparison withoptical and infrared wavebands and a precise determination plays an importantrole in correctly recovering the ultraviolet brightness and colors of objects.By finding the observed bluest colors at given effective temperature andmetallicity range of dwarf stars, stellar intrinsic colors, $C^0_{\rm B,V}$,$C^0_{\rm NUV,B}$, $C^0_{\rm FUV,B}$ and $C^0_{\rm FUV,NUV}$, are derivedaccording to the stellar parameters from the LAMOST spectroscopic survey andphotometric results from the $GALEX$ and APASS surveys. With the derivedintrinsic colors, the ultraviolet color excesses are calculated for about25,000 A- and F-type dwarf stars. Analysis of the color excess ratios yieldsthe extinction law related to the $GALEX$ UV bands: $E_{{\rm NUV,B}}$/$E_{{\rmB,V}} = 3.77$, $E_{{\rm FUV,B}}$/$E_{{\rm B,V}} = 3.39$, $E_{{\rmFUV,NUV}}$/$E_{{\rm B,V}} = -0.38$. The results agree very well with previousworks in the $NUV$ band and in general with the extinction curve derived byFitzpatrick (1999) for $R_{\rm V}=3.35$.

The Ultraviolet Extinction in the $GALEX$ Bands