  The spectral variability of a sample of 44 flat-spectrum radio quasars
(FSRQs) and 18 steep-spectrum radio quasars (SSRQs) in the SDSS stripe 82
region is investigated. Twenty-five of 44 FSRQs show a bluer-when-brighter
trend (BWB), while only one FSRQ shows a redder-when-brighter trend, which is
in contrast to our previous results. Eight of 18 SSRQs display a BWB. We found
an anti-correlation between the Eddington ratio and the variability amplitude
in r band for SSRQs, which is similar to that in radio-quiet AGNs. This implies
that the thermal emission from the accretion disk may be responsible for the
variability in SSRQs. The spectral variability from the SDSS multi-epoch
spectroscopy also shows BWB for several SSRQs, consistent with that from
photometry.
