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Observations of large supernova remnants (SNRs) at high frequencies are rare,but provide valuable information about their physical properties. The totalintensity and polarization properties of 16 large SNRs in the Galactic planewere investigated based on observations of the Urumqi $\lambda$6\ cmpolarization survey of the Galactic plane with an angular resolution of9$\farcm$5. We extracted total intensity and linear polarization maps of largeSNRs from the Urumqi $\lambda$6\ cm survey, obtained their integrated fluxdensities, and derived the radio spectra in context with previously publishedflux densities at various frequencies. In particular, Effelsberg $\lambda$11\cm and $\lambda$21\ cm survey data were used for calculating integrated fluxdensities. The $\lambda$6\ cm polarization data also delineate the magneticfield structures of the SNRs. We present the first total intensity maps at$\lambda$6\ cm for SNRs G106.3+2.7, G114.3+0.3, G116.5+1.1, G166.0+4.3 (VRO42.05.01), G205.5+0.5 (Monoceros Nebula) and G206.9+2.3 (PKS 0646+06) and thefirst polarization measurements at $\lambda$6\ cm for SNRs G82.2+5.3 (W63),G106.3+2.7, G114.3+0.3, G116.5+1.1, G166.0+4.3 (VRO 42.05.01), G205.5+0.5(Monoceros Nebula) and G206.9+2.3 (PKS 0646+06). Most of the newly derivedintegrated radio spectra are consistent with previous results. The new fluxdensities obtained from the Urumqi $\lambda$6\ cm, Effelsberg $\lambda$11\ cmand $\lambda$21\ cm surveys are crucial to determine the spectra of SNRG65.1+0.6, G69.0+2.7 (CTB 80), G93.7-0.2 and G114.3+0.3. We find thatG192.8$-$1.1 (PKS 0607+17) consists of background sources, \ion{H}{II} regionsand the extended diffuse emission of thermal nature, and conclude thatG192.8$-$1.1 is not a SNR.

A Sino-German $\lambda$6\ cm polarization survey of the Galactic plane. V. Large supernova remnants